Introductory Physics I Exam Review

Course Introduction

Introductory Physics I provides a foundational understanding of classical physics, covering key concepts such as motion, force, energy, momentum, and the laws of Newton. The course emphasizes problem-solving, critical thinking, and the application of mathematical tools to analyze real-world phenomena. Topics include kinematics, dynamics, work and energy, conservation laws, and mechanical systems. Through lectures, laboratory experiments, and collaborative activities, students develop both qualitative and quantitative skills essential for further studies in science, engineering, and related fields.

Recommended Textbook

College Physics 1st Edition by Eugenia Etkina

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30 Chapters

3319 Verified Questions

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Page 2

Chapter 1: Introduction

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Sample Questions

Q1) A reasonable estimate for the mass of an ordinary passenger car is

A)100 kg

B)1000 kg

C)5000 kg

D)10,000 kg

Answer: B

Q2) Which one of the following numbers is equivalent to the number 0.0001776?

A)1.776 × 10-4

B)17.76 × 10-3

C)1776 × 10-5

D)177.6 × 10-7

Answer: A

Q3) The prefix yotta (Y)signifies a multiple of 1024.How many yottameters are there in a gigameter?

Answer: 10-15 ym

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Chapter 2: Kinematics: Motion in One Dimension

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Sample Questions

Q1) A car travels at 15 m/s for 10 s.It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s.At the end of this time,what is its velocity?

A)15 m/s

B)30 m/s

C)45 m/s

D)375 m/s

Answer: C

Q2) A ball is thrown straight up,reaches a maximum height,then falls to its initial height.Which of the following statements about the direction of the velocity and acceleration of the ball as it is going up is correct?

A)Both its velocity and its acceleration point upward.

B)Its velocity points upward and its acceleration points downward.

C)Its velocity points downward and its acceleration points upward.

D)Both its velocity and its acceleration points downward.

Answer: B

Q3) If the velocity of an object is zero,then that object cannot be accelerating.

A)True

B)False

Answer: False

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Page 4

Chapter 3: Newtonian Mechanics

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Sample Questions

Q1) A golf club hits a golf ball with a force of 2400 N,sending the ball into the air.The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward.

A) True

B) False

C)The answer depends on whether the golfer followed through with the swing.

Answer: B

Q2) You pull on a crate with a rope.If the crate moves,the rope's pull on the crate must have been larger than the crate's pull on the rope,but if the crate does not move,both of these pulls must have been equal.

A)True

B)False

Answer: False

Q3) A box is placed on a table which rests on the floor.The box pushes on the table; the Newton's third law pair to the the box's push on the table is the table's push on the floor.

A)True

B)False

Answer: False

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Chapter 4: Applying Newtons Laws

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Sample Questions

Q1) A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal.The ball leaves her hand 1.0 m above the ground.At what angle below the horizontal does the ball approach the ground assuming no effects of air?

A)35°

B)42°

C)48°

D)40°

E)65°

Q2) A certain aircraft has a mass of 300,000 kg.At a certain instant during its landing,its speed is 27.0 m/s.If the stopping force exerted on the airplane is a constant 445,000 N,what is the speed of the airplane 10.0 s later?

A)10.0 m/s

B)12.2 m/s

C)14.0 m/s

D)18.0 m/s

E)20.0 m/s

Q3) A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km.If there was no air,at what angle above the horizontal did it leave the ground?

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Chapter 5: Circular Motion

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Sample Questions

Q1) Two small objects,with masses m and M,are originally a distance r apart,and the magnitude of the gravitational force they exert on each one is F.The masses are changed to 2m and 2M,and the distance is changed to 4r.What is the magnitude of the new gravitational force?

A)F/16

B)F/4

C)16F

D)4F

E)F/2

Q2) When a car goes around a circular curve on a horizontal road at constant speed,what force causes it to follow the circular path?

A)the normal force exerted on the car by the road perpendicular to the road

B)the friction force exerted by the road on the car

C)the force that Earth exerts on the car

D)No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.

Q3) What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67 × 10-11 N m2/kg2)

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Page 7

Chapter 6: Impulse and Linear Momentum

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Sample Questions

Q1) A small car meshes with a large truck in a head-on collision.Which of the following statements concerning the momentum during the collision are correct? (There could be more than one correct choice.)

A)The momentum of the truck is constant.

B)The momentum of the car is constant.

C)The car and the truck must undergo the same change in speed.

D)The momentum of the car and the momentum of the truck are each constant.

E)The momentum of the car-truck system is constant, but the momentum of each one separately is not constant.

Q2) A steady horizontal force lasting for 2.1 s causes a 1.25 kg object to accelerate at 3.2 m/s2 on a frictionless table.What impulse does this force exert on the object?

A)26 kg m/s

B)11 kg m/s

C)8.4 kg m/s

D)2.6 kg m/s

Q3) A 0.17-kg baseball is thrown with a speed of 38 m/s and it is hit straight back toward the pitcher with a speed of 62 m/s.What is the magnitude of the impulse exerted by the bat on the ball?

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Page 8

Chapter 7: Work and Energy

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Sample Questions

Q1) Three cars (car L,car M,and car N)are moving with the same speed and slam on their brakes.The most massive car is car L,and the least massive is car N.If the tires of all three cars have identical coefficients of kinetic friction with the road surface,for which car is the amount of work done by friction in stopping it the greatest?

A)The amount of work done by friction is the same for all cars.

B)Car L

C)Car M

D)Car N

Q2) A certain car traveling at 34.0 mph skids to a stop in 29 meters from the point where the brakes were applied.In approximately what distance would the car have stopped had it been going 105.4 mph?

A)279 m

B)158 m

C)90 m

D)51 m

E)29 m

Q3) A 2.0-kg object (the system)is lifted vertically through 3.00 m by a constant 150-N force.How much work did Earth do on the object during this process?

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Chapter 8: Extended Bodies at Rest

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Sample Questions

Q1) Three objects are located in the x-y plane as follows: a 6 kg-object is at (0 m,0 m),a mass of 4 kg is at (3 m,0 m),and a 2 kg-object is at (0 m,3 m).Where is the center of mass of the system?

A)(1 m, 2 m)

B)(2 m, 1 m)

C)(1 m, 1 m)

D)(1 m, 0.5 m)

E)(0.5 m, 1 m)

Q2) A 5.00-m-long 200-N uniform ladder, rests against a smooth vertical wall with its base on a horizontal rough floor,a distance of 1.20 m away from the wall.The coefficient of static friction between the ladder and the floor is 0.200.How far up the ladder,measured along the ladder,can a 600-N person climb before the ladder begins to slip?

A)1.50 m

B)1.26 m

C)1.05 m

D)3.95 m

E)4.56 m

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Page 10

Chapter 9: Rotational Motion

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Sample Questions

Q1) When a fan is turned off,its angular speed decreases from 10 rad/s to 6.3 rad/s in 5.0 s.What is the magnitude of the average angular acceleration of the fan?

A)0.86 rad/s2

B)0.74 rad/s2

C)0.37 rad/s2

D)11 rad/s2

E)1.2 rad/s2

Q2) A wheel having a moment of inertia of 5.00 kg m2 starts from rest and accelerates under a constant torque of 3.00 N m for 8.00 s.What is the wheel's rotational kinetic energy at the end of 8.00 s?

A)57.6 J

B)64.0 J

C)78.8 J

D)122 J

Q3) The sun subtends an angle of 0.00928 rad when viewed from the surface of the earth,and its distance from Earth is 1.5 × 1011 m.What is the diameter of the sun?

Q4) Express the angular speed of an old 33 1/3 rpm LP in rad/s.

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Chapter 10: Gases

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Sample Questions

Q1) A 5.3 L flask of ideal neon gas (which is monatomic)is at a pressure of 6.0 atm and a temperature of \(290 \mathrm {~K} .\) The atomic mass of neon is 20.2 g/mol.What is the mass of the neon gas in the flask.(R = 8.31 J/mol K,1 atm = 101 kPa,NA = 6.022 × 1023 molecules/mol)

A)2.7 × 10-2

B)1.6 × 10-2

C)1.3 × 101

D)2.7 × 101

E)2.7 × 103

Q2) A 50.0-N brick has the following measures: 30.0 cm × 10.0 cm × 4.00 cm.What is the maximum pressure it can exert on a horizontal surface due to its interaction with Earth?

A)1.25 Pa

B)12.5 Pa

C)1.25 kPa

D)12.5 kPa

Q3) Originally 2.00 mol of gas are at standard temperature and pressure If the temperature changes to 47.0°C and the pressure decreases to half of what it was,how many liters do the two moles now occupy? (1 atm = 101 kPa,R = 8.31 J/mol K)

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Chapter 11: Static Fluids

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Sample Questions

Q1) A spherical ball of lead (density 11.3 g/cm3)is placed in a tub of mercury (density 13.6 g/cm3).Which answer best describes the result?

A)The lead ball will float with about 83% of its volume above the surface of the mercury.

B)The lead ball will float with its top exactly even with the surface of the mercury.

C)The lead ball will float with about 17% of its volume above the surface of the mercury.

D)The lead will sink to the bottom of the mercury.

Q2) Salt water is denser than fresh water.A ship floats in both fresh water and salt water.Compared to the fresh water,the volume of water displaced in the salt water is A)more.

B)less.

C)the same.

D)Cannot be determined because we do not know the volume of the ship.

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Chapter 12: Fluids in Motion

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Sample Questions

Q1) For a certain patient,the build-up of fatty tissue on the wall of an artery has decreased the arterial radius by 10%.By how much would the pressure provided by the heart have to be increased to maintain a constant volume of blood flow? Model the blood as an ideal incompressible fluid.

A)48%

B)52%

C)46%

D)54%

Q2) Water is flowing in a drainage channel of rectangular cross-section.The width of the channel is 15 m,the depth of water is 8.0 m,and the speed of the flow is 2.5 m/s.What is the mass flow rate of the water? The density of water is 1000 kg/m3.

A)2.0 × 105 kg/s

B)2.0 × 103 kg/s

C)3.0 × 105 kg/s

D)3.0 × 103 kg/s

E)3.0 × 102 kg/s

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Chapter 13: First Law of Thermodynamics

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Sample Questions

Q1) In a given reversible process,the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume.Which one of the following statements about the gas is correct?

A)The gas must absorb thermal energy through the process of heating from its surroundings.

B)The gas must release thermal energy by heating to its surroundings.

C)The pressure of the gas also stays constant.

D)The process is adiabatic.

E)It is impossible to predict on the basis of this data.

Q2) A 45.0-kg sample of ice is at 0.00° C.How much thermal energy is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg.

A)1.50 × 104 kJ

B)4.10 × 106 kJ

C)0.00 kJ

D)1.02 × 105 kJ

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Chapter 14: Second Law of Thermodynamics

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Sample Questions

Q1) When water at 0°C freezes,the entropy of the water

A)increases.

B)decreases.

C)remains constant.

D)could either increase or decrease; it depends on other factors.

Q2) A thermodynamic engine absorbs 85.6 kJ of energy each cycle and exhausts 61.8 kJ.

(a)What is the efficiency of the engine?

(b)How much work does it do each cycle?

Q3) During each cycle,a refrigerator removes 20.0 kJ of heat from the freezing compartment and ejects 24.0 kJ into a room.

(a)How much work per cycle is required each cycle to run this refrigerator?

(b)What is the coefficient of performance of this refrigerator?

Q4) What is the change in entropy of the ice when a 0.050-kg ice cube at 0°C melts? The latent heat of fusion for water is 80 cal/g.

Q5) If the efficiency of a reversible engine is 28%,what is its COP (performance coefficient)operated (a)as a refrigerator,and (b)as a thermodynamic pump?

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Chapter 15: Electric Charge force and Energy

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Sample Questions

Q1) Two identical small charged spheres are a certain distance apart,and there is an electrostatic force of magnitude F that they exert on each other.With time,charge gradually diminishes on both spheres by leaking off.When each of the spheres has lost half its initial charge,what will be the magnitude of the electrostatic force exerted on each one?

A)1/16 F

B)1/8 F

C)1/4 F

D)1/2 F

E)1/ \(\sqrt { 2 }\) F

Q2) Electrically neutral objects cannot exert an electrical force on each other,but they can exert a gravitational force on each other.

A)True

B)False

Q3) Three point charges are placed on the x-axis,as follows.A charge of +2.0 C is at the origin,a charge of -2.0 C is at x = 50 cm,and a charge of +4.0 C is at x = 100 cm.What are the magnitude and direction of the net electrostatic force exerted on the charge at the origin by the other two charges? (k = 1/4 0 = 9.0 × 109 N m2/C2)

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Page 17

Chapter 16: The Electric Field

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Sample Questions

Q1) As a proton moves in the direction the \(\vec { E }\) field lines

A)it is moving from field's low potential to high potential and electric potential energy of the system proton-electric field is increasing.

B)it is moving from field's low potential to high potential and electric potential energy of the system proton-electric field is decreasing.

C)it is moving from field's high potential to low potential and electric potential energy of the system proton-electric field is increasing.

D)it is moving from field's high potential to low potential and electric potential energy of the system proton-electric field is decreasing.

E)both it's the electric potential and electric potential energy of the system proton-electric field remain constant.

Q2) A thin spherical copper shell of radius 9.5 cm carries an excess charge of -4.2 nC.How many excess electrons are on (a)the outer surface of the shell,and (b)the inner surface? (e = 1.60 × 10-19C)

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Chapter 17: Dc Circuits

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Sample Questions

Q1) What is the current through a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)

A)0.013 A

B)0.31 A

C)6.3 A

D)78 A

Q2) When a 1.0-m length of metal wire is connected to a \(1.5 - V\) battery,there is a current of \(8.0 \mathrm {~mA}\) through it.What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 m.

A)12 m

B)6.0 m

C)24 m

D)2.2 m

Q3) A kilowatt-hour is equivalent to

A)1000 W.

B)3600 J.

C)3,600,000 J/s.

D)3,600,000 J.

E)3600 J/s

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Page 19

Chapter 18: Magnetism

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Sample Questions

Q1) The \(\vec { B }\) field at a distance of 2 cm from a long straight current-carrying wire is 4 T.What is the \(\vec { B }\) field at a distance of 1 cm from this wire?

A)2 T

B)4 T

C)6 T

D)8 T

E)10 T

Q2) What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?

A)0.23 A m2

B)2.3 A m2

C)23 A m2

D)230 A m2

Q3) A flat coil containing 25 identical loops carries 6.4 A of current.When it is placed in a uniform magnetic field of 0.22 T that is oriented parallel to the plane of the coil,the magnetic torque on it is 3.7 N m.

(a)What is the magnetic moment of the coil?

(b)What is the area of each loop?

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Page 20

Chapter 19: Electromagnetic Induction

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Sample Questions

Q1) A flat coil is wrapped with 200 turns of very thin wire on a square frame with sides 18 cm long.A uniform magnetic field is applied perpendicular to the plane of the coil.If the magnitude of the \(\vec { B }\) field changes uniformly from 0.50 T to 0.00 T in 8.0 s,find the emf induced in the coil.

A)2.1 mV

B)4.1 mV

C)0.21 V

D)0.41 V

Q2) A circular coil of copper wire is lying flat on a horizontal table.A bar magnet is held above the center of the coil with its south pole downward.The magnet is released from rest and falls toward the coil.As viewed from above,what is the direction of the current induced in the coil as the magnet approaches the coil?

A)counterclockwise

B)clockwise

C)No current is induced in the coil.

D)An emf but no current is induced in the coil.

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Chapter 20: Vibrational Motion

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Sample Questions

Q1) The period of a simple pendulum that is 1.00 m long on another planet is \(1.66 \mathrm {~s} .\) What is the free fall acceleration on this planet if the mass of the pendulum bob is 1.5 kg?

A)14.3 m/s2

B)13.3 m/s2

C)15.7 m/s2

D)17.2 m/s2

Q2) The total mechanical energy of a simple harmonic oscillating system is

A)zero as it passes the equilibrium point.

B)zero when it reaches the maximum displacement.

C)a maximum when it passes through the equilibrium point.

D)a minimum when it passes through the equilibrium point.

E)a non-zero constant.

Q3) A simple pendulum having a bob of mass M has a period T.If you double M but change nothing else,what would be the new period?

A)2T

B)T \(\sqrt { 2 }\)

C)T

D)T/ \(\sqrt { 2 }\)

E)T/2

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Chapter 21: Mechanical Waves

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Sample Questions

Q1) By how many decibels does the intensity level of a sound decrease when you triple your distance from a source of sound?

A)9.5 dB

B)4.8 dB

C)6.0 dB

D)12 dB

E)3.0 dB

Q2) What is the length of the shortest pipe closed on one end and open at the other end that will have a fundamental frequency of 0.060 kHz on a day when the speed of sound is 340 m/s?

A)1.24 m

B)1.42 m

C)2.14 m

D)4.12 m

Q3) A wave whose wavelength is 0.500 m is traveling down a 500-m long wire whose total mass is 25 kg and is under a tension of 2000 N.

(a)What is the speed of the wave on the wire?

(b)Find the frequency of this wave.

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Chapter 22: Reflection and Refraction

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Q1) A light ray enters a glass enclosed fish tank.From air it enters the glass at 20° with respect to the plane of the surface and then emerges into the water.The index for the glass is 1.50 and for water 1.33.

(a)What is the angle of refraction in the glass?

(b)What is the angle of refraction in the water?

(c)Is there any incident angle in air for which the ray will not enter the water due to total internal reflection? If so,find it.

Q2) Light goes from material having a refractive index of n1 into a material with refractive index n2.If the refracted light is bent away from the normal,what can you conclude about the indices of refraction?

A)n1 > n2

B)n1 n2

C)n1 < n2

D)n1 n2

E)n1 = n2

Q3) A point source of light is positioned 20.0 m below the surface of a lake.What is the diameter of the largest circle on the surface of the water through which light can emerge into the air? The index of refraction of water is 1.33.

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Chapter 23: Mirrors and Lenses

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Q1) The objective lens of a microscope has a focal length of 2.4 mm and the eyepiece has an angular magnification of 15.The object is positioned 0.060 mm beyond the focal point of the objective.The focal point of the eyepiece is positioned at the real image formed by the objective.The near point of the microscope user is at 25 cm.What is the distance between the objective lens and the eyepiece?

A)98 mm

B)102 mm

C)107 mm

D)111 mm

E)115 mm

Q2) As you walk away from a plane mirror on a wall,the height of your image A)gets smaller.

B)may or may not get smaller, depending on where the observer is positioned. C)is always a real image, no matter how far you are from the mirror.

D)changes from being a virtual image to a real image as you pass the focal point. E)is always the same size.

Q3) For an eye that is 2.4 cm in diameter,what must be the range of focal lengths of the lens to focus objects from the near point (25 cm)to infinity on the retina?

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Chapter 24: Wave Optics

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Q1) At most,how many bright fringes can be formed on one side of the central bright fringe (not counting the central bright fringe)when light of 625 nm falls on a pair of slits that are \(6.77 \times 10 ^ { - 6 } \mathrm {~m}\) apart?

A)10

B)9

C)8

D)11

E)12

Q2) Light having a speed in vacuum of 3.0 × 108 m/s enters a liquid of refractive index 2.0.In this liquid,its speed will be

A)6.0 × 108 m/s

B)3.0 × 108 m/s

C)1.5 × 108 m/s

D)0.75 × 108 m/s

E)0.67 × 108 m/s

Q3) Light in air of wavelength 500 nm illuminates a soap film that has an index of refraction of 1.3 and air on both sides.What is the minimum thickness of this film that will produce cancellation in the reflected light when the light is incident normally on the film?

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Chapter 25: Electromagnetic Waves

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Q1) A sinusoidal electromagnetic wave has a peak electric field of \(8.00 \mathrm { kV } / \mathrm { m }\) What is the intensity of the wave? \(\left( c = 3.0 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , \right.\) \(\mu _ { 0 } = 4 \pi \times 10 ^ { - 7 } \mathrm {~T} \cdot \mathrm { m } / \mathrm { A } ,\) \(\left. \varepsilon _ { 0 } = 8.85 \times 10 ^ { - 12 } \mathrm { C } ^ { 2 } / \mathrm { N } \cdot \mathrm { m } ^ { 2 } \right)\)

A)170 kW/m2

B)85 kW/m2

C)21 kW/m2

D)11 kW/m2

Q2) A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions.What is the amplitude of the electric field of this light at a distance of 0.400 m from the bulb? ( 0 = 8.85 × 10-12 C2/N m2, 0 = 4 × 10-7 T m/A,c = 3.00 × 108 m/s)

A)162 N/C

B)212 N/C

C)82.1 N/C

D)150 N/C

E)52.9 N/C

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Chapter 26: Special Relativity

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Q1) A proton,which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory.What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)

A)4.0 × 10-19 kg m/s

B)4.4 × 10-19 kg m/s

C)5.0 × 10-19 kg m/s

D)5.8 × 10-19 kg m/s

E)6.7 × 10-19 kg m/s

Q2) As an electron slows down from 0.9980c to 0.5000c,how much momentum does it lose? (c = 3.0 × 108 m/s,melectron = 9.11 × 10-31 kg)

Q3) If the mass of a 1.0-kg book could be entirely converted into electrical energy,how many kW h of energy would that generate? (c = 3.0 × 108 m/s)

Q4) How much energy would be released if 2.0 kg of material was lost during a reaction? (c = 3.0 × 108 m/s)

A)1.8 × 1017 J

B)1.5 × 1016 J

C)6.0 × 108 J

D)4.7 × 10-8 J

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Chapter 27: Quantum Optics

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Q1) What is the wavelength of a photon having energy 2.00 eV? (c = 3.00 × 108 m/s,h = 6.626 × 10-34 J s,1 eV = 1.60 × 10-19 J)

Q2) A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV.What is the threshold (cutoff)frequency for photoelectron production? (1 eV = 1.60 × 10-19 J,h = 6.626 × 10-34 J s)

A)6.8 × 1014 Hz

B)2.9 × 1014 Hz

C)7.7 × 1014 Hz

D)8.6 × 1014 Hz

E)9.7 × 1014 Hz

Q3) If the wavelength of a photon is the same as the de Broglie wavelength of an electron,which one has the greater momentum?

A)The electron because it has more mass.

B)The photon because it is traveling faster.

C)They both have the same momentum.

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Chapter 28: Atomic Physics

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Q1) How many electrons will fit into a 4f subshell?

A)3

B)4

C)7

D)14

Q2) In its ground state,the quantum numbers (n,,m1,ms)for hydrogen are,respectively,

A)1, 1, 1, 1.

B)1, 0, 0, 0.

C)1, 0, 0, ±1/2.

D)1, 1, 1, ±1/2.

Q3) What is the value of n in the Balmer series for which the wavelength is 410.2 nm.

A)4

B)5

C)6

D)7

E)9

Q4) Write out the electron configuration for the ground state of the phosphorus atom,which has 15 electrons.

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Chapter 29: Nuclear Physics

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Q1) If the half-life of a material is 45 years,how much of it will be left after 100 years?

A)more than 1/2

B)less than 1/2 but more than 1/4

C)more than 1/4 but less than 1/2

D)less than 1/4 but more than 1/8

E)less than 1/8

Q2) When a stationary plutonium-239, \(^{239}

_{94} Pu\),decays into uranium-235 plus an alpha particle,the energy released in the process is 5.24 MeV.The following masses are known: \({}^{4}_{2}\) He: 4.002603 u \(^{235}

_{92} U\): 235.043924 u What is the mass of the \(^{239} _{94} Pu\) nucleus,in amu? (1 u = 931.494 MeV/c2)

A)239.05215 u

B)239.02775 u

C)239.00189 u

D)238.99919 u

E)238.98884 u

Q3) The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s.What is the half-life of this sample?

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Chapter 30: Particle Physics

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Q1) Inside the nucleus,the strongest of the four fundamental forces is

A)the weak nuclear force.

B)the electromagnetic force.

C)the gravitational force.

D)the strong nuclear force.

Q2) What combination of quarks produces a neutron and what are the electric charges on these quarks,expressed in terms of e?

Q3) Which of the following particles are not made up of quarks? (There could be more than one correct choice.)

A)alpha particle

B)electron

C)proton

D)positron

E)neutron

Q4) The main reason that there is a limit to the size of a stable nucleus is

A)the limited range of the gravitational force.

B)the short range nature of the strong nuclear force.

C)the weakness of the gravitational force.

D)the weakness of the electrostatic force.

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