Physics for Engineers I Test Bank

Course Introduction

Physics for Engineers I is an introductory course designed to provide engineering students with a foundational understanding of classical mechanics, emphasizing the principles and applications most relevant to engineering disciplines. Topics include kinematics, Newtons laws of motion, work and energy, momentum, rotational motion, oscillations, and the basics of thermodynamics. The course integrates theoretical concepts with practical problem-solving skills, fostering a deep comprehension of physical laws and their significance in engineering contexts. Laboratory exercises complement the lectures, allowing students to gain hands-on experience with experimental techniques and data analysis in physics.

Recommended Textbook

College Physics 1st Edition by Eugenia Etkina

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30 Chapters

3319 Verified Questions

3319 Flashcards

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Chapter 1: Introduction

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Sample Questions

Q1) A reasonable estimate for the mass of a typical female college student is A)20 kg.

B)50 kg.

C)150 kg.

D)200 kg.

Answer: B

Q2) If a circle has a radius of 1.109 m,what is its area expressed to the correct number of significant figures?

A)3.86 m2

B)3.863 m2

C)3.864 m2

D)3.8638 m2

E)3.86379 m2

Answer: C

Q3) A reasonable estimate for the duration of a typical physics lecture is A)600 s.

B)1000 s.

C)3500 s.

D)10,000 s.

Answer: C

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Chapter 2: Kinematics: Motion in One Dimension

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Sample Questions

Q1) To determine the height of a bridge above the water,a person drops a stone and measures the time it takes for it to hit the water.If the time is 2.3 s,what is the height of the bridge? Neglect air resistance.

A)10 m

B)14 m

C)26 m

D)32 m

E)52 m

Answer: C

Q2) A rock is thrown upward with a speed of 12 m/s on the surface of planet X where the acceleration of objects in free fall is 1.5 m/s2 and there is no atmosphere.What is the maximum height reached by the laser?

A)8.0 m

B)18 m

C)48 m

D)144 m

Answer: C

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Chapter 3: Newtonian Mechanics

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Sample Questions

Q1) A 75-N box rests on a perfectly smooth horizontal surface.The minimum force need to start the box moving is

A)75 N.

B)7.5 N.

C)750 N.

D)any horizontal force greater than zero.

Answer: D

Q2) A person is using a rope to lower a 5.0-N bucket into a well with a constant speed of 2.0 m/s.What is the magnitude of the force exerted by the rope on the bucket?

A)0.00 N

B)2.0 N

C)5.0 N

D)10 N

E)49 N

Answer: C

Q3) During a hard stop,a car and its passengers slow down with an acceleration of 8.0 m/s2.What magnitude force does a 50-kg passenger exert on the seat belt in such a stop?

Answer: 400 N

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Chapter 4: Applying Newtons Laws

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Sample Questions

Q1) The eastward component of vector \(\vec { A }\) is equal to the westward component of vector \(\vec { B }\) and their northward components are equal.Which one of the following statements must be correct for these two vectors?

A)Vector \(\vec { A }\) is parallel to vector \(\vec { B }\)

B)Vector \(\vec { A }\) is antiparallel (in the opposite direction)to vector \(\vec { B }\)

C)Vector \(\vec { A }\) must be perpendicular to vector \(\vec { B }\)

D)The magnitude of vector \(\vec { A }\) must be equal to the magnitude of vector \(\vec { B }\)

E)The angle between vector \(\vec { A }\) and vector \(\vec { B }\) must be 90°.

Q2) A 40-kg box is being pushed along a horizontal smooth surface.The pushing force is 15 N directed at an angle of 15° below the horizontal.What is the magnitude of the acceleration of the crate?

A)0.16 m/s2

B)0.36 m/s2

C)0.47 m/s2

D)0.39 m/s2

E)0.68 m/s2

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Chapter 5: Circular Motion

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Sample Questions

Q1) A large telescope of mass 8410 kg is in a circular orbit around the earth,making one revolution every 927 minutes.What is the magnitude of the gravitational force exerted on the satellite by the earth? (G = 6.67 × 10-11 N m2/kg2,Mearth = 6.0 × 1024 kg)

Q2) Suppose our sun had 4 times its present mass but the earth orbited it at the same distance as it presently does.What would be the length of the year on the earth under those conditions?

A)1/4 as long as the present year

B)1/2 as long as the present year

C)the same as the present year

D)twice as long as the present year

E)four times as long as the present year

Q3) The Moon is accelerated toward the earth,so it is gradually getting closer to the earth.

A) True

B) False

C)The moon is not accelerated toward the earth.

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Page 7

Chapter 6: Impulse and Linear Momentum

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Sample Questions

Q1) A 1200-kg car moving at \(15.6 \mathrm {~m} / \mathrm { s }\) suddenly collides with a stationary car of mass \(1500 \mathrm {~kg} \text {. }\) If the two vehicles lock together,what is their combined velocity immediately after the collision?

A)6.9 m/s

B)8.6 m/s

C)12.1 m/s

D)5.5 m/s

Q2) 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.

Q3) A batter exerts an average force of 8000 N to a baseball for 1.1 ms.What is the magnitude of the impulse exerted on the baseball by the bat?

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Chapter 7: Work and Energy

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Sample Questions

Q1) When you drop a pebble from height H,it reaches the ground with speed V assuming there is no air resistance.From what height should you drop it so it will reach the ground with twice speed?

A) \(\sqrt { 2 }\) H

B)2H

C)4H

D)8H

E)16H

Q2) If you want to double the kinetic energy of a gas molecule,by what factor must you increase its momentum?

A) \(\sqrt { 2 }\)

B)2

C)2 \(\sqrt { 2 }\)

D)4

E)16

Q3) A family goes on vacation for one week but forgets to turn off an electric fan that consumes electricity at the rate of 200 W.If the cost of electricity is 12.0¢/kWh how much does it cost (to the nearest penny)to run the fan for the week?

Q4) How fast must a 6.0-kg cat run to have a kinetic energy of 150 J?

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Chapter 8: Extended Bodies at Rest

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Sample Questions

Q1) A 30-kg child stands at one end of a floating 20-kg canoe that is 5.0-m long and initially at rest in the water.The child then slowly walks to the other end of the canoe.How far does the canoe move in the water,assuming water friction is negligible?

A)1.0 m

B)2.0 m

C)3.0 m

D)4.0 m

E)5.0 m

Q2) A 15-kg child is sitting on a playground teeter-totter,1.5 m from the pivot.What is the magnitude of the minimum force,applied 0.30 m on the other side of the pivot,that is needed to make the child lift off the ground?

A)75 N

B)740 N

C)23 N

D)44 N

E)66 N

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Chapter 9: Rotational Motion

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Sample Questions

Q1) A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round.As he does this,it is true to say that

A)the moment of inertia of the system decreases and the angular speed increases.

B)the moment of inertia of the system decreases and the angular speed decreases.

C)the moment of inertia of the system decreases and the angular speed remains the same.

D)the moment of inertia of the system increases and the angular speed increases. E)the moment of inertia of the system increases and the angular speed decreases.

Q2) A uniform solid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25° with the horizontal.What is the forward speed of the disk after it has rolled 3.0 m,measured along the plane?

A)2.0 m/s

B)3.5 m/s

C)4.1 m/s

D)5.7 m/s

E)6.3 m/s

Q3) A cylinder of radius 8.0 cm rolls 20 cm in 5.0 s without slipping.Through how many degrees does the cylinder turn during this time?

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Chapter 10: Gases

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Sample Questions

Q1) Which two temperature changes are equivalent?

A)1 K = 1 F°

B)1 F° = 1 C°

C)1 C° = 1 K

D)none of the above

Q2) At what,if any,temperature are the numerical readings on the Fahrenheit and Celsius scales the same?

A)-30°

B)-40°

C)-50°

D)-60°

E)They can never read the same because they are based on different zeroes.

Q3) The temperature changes from 35°F during the night to 75°F during the day.What is the temperature change on the Celsius scale?

A)72 C°

B)40 C°

C)32 C°

D)22 C°

Q4) What is absolute zero on the (a)Celsius scale and (b)on the Fahrenheit scale?

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Chapter 11: Static Fluids

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Sample Questions

Q1) A steel ball sinks in water but floats in a pool of mercury,which is much denser than water.Where is the buoyant force exerted on the ball by the liquid greater?

A)floating on the mercury

B)submerged in the water

C)It is the same in both cases.

D)It cannot be determined from the information given.

Q2) A rectangular wooden block measures 10.0 cm × 4.00 cm × 2.00 cm.When the block is placed in water,it floats horizontally,with its bottom face 1.65 cm below the surface.What is the density of the wood? The density of water is 1.00 g/cm3.

A)0.825 g/cm3

B)1.21 g/cm3

C)1.65 g/cm3

D)0.606 g/cm3

E)0.350 g/cm3

Q3) A wooden raft has a mass of 55 kg.When empty it floats in water (density \(\left. 1000 \mathrm {~kg} / \mathrm { m } ^ { 3 } \right)\) with 64% of its volume submerged.What maximum mass of sand can be put on the raft without sinking it?

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Chapter 12: Fluids in Motion

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Sample Questions

Q1) Consider a very small hole in the bottom of a tank that is \(17.0 \mathrm {~cm}\) in diameter and filled with water to a height of \(90.0 \mathrm {~cm}\) Find the speed at which the water exits the tank through the hole.

A)4.20 m/s

B)17.64 m/s

C)44.1 m/s

D)48.3 m/s

Q2) 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%

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Chapter 13: First Law of Thermodynamics

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Sample Questions

Q1) A glass beaker of unknown mass contains \(74.0 \mathrm { ml }\) of water.The system absorbs \(2000.0 \mathrm { cal }\) of thermal energy and the temperature rises \(20.0 ^ { \circ } \mathrm { C }\) as a result.What is the mass of the beaker? The specific heat of glass is 0.18 cal/g °C,and that of water is 1.0 cal/g C°.

A)140 g

B)560 g

C)540 g

D)270,000 g

Q2) A gas expands from an initial volume of 0.040 m3 to a final volume of 0.085 m3 while its pressure increases linearly with the volume (so that the process follows a straight-line path in a pV diagram)from 110 kPa to 225 kPa.How much work is done on the gas during this expansion?

A)-5.2 kJ

B)-7.5 kJ

C)-7.8 kJ

D)-11 kJ

E)-12 kJ

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Page 15

Chapter 14: Second Law of Thermodynamics

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Sample Questions

Q1) An ideal Carnot thermodynamic engine has an efficiency of 0.600.If it operates between a deep lake with a constant temperature of \(294.0 \mathrm {~K}\) and a hot reservoir,what is the temperature of the hot reservoir?

A)735 K

B)490 K

C)470 K

D)784 K

Q2) An ideal Carnot engine operates between a high temperature reservoir at \(492 \mathrm {~K}\) and a river with water at \(290 \mathrm {~K} .\) If it absorbs \(4000 \mathrm {~J}\) of energy each cycle,how much work per cycle does it perform?

A)1642 J

B)2358 J

C)1483 J

D)2517 J

Q3) An ideal Carnot engine is operated between a hot and a cold reservoir.The temperature difference between the two reservoirs is 284°C.If the efficiency of this ideal engine is 24.0%,find the temperature of the cold reservoir in degrees Celsius.

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Page 16

Chapter 15: Electric Charge force and Energy

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Sample Questions

Q1) Two tiny grains of sand having charges of 4.0 C and -4.0 C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m.What is electric potential energy of the system of these grains assuming that at infinity the energy of the system is zero? (k = 1/4 0 = 9.0 × 109 N m2/C2)

A)-36 mJ

B)36 mJ

C)0 J

D)-72 mJ

E)72 mJ

Q2) 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)

Q3) How far apart should two protons be if the electrical force of repulsion exerted on each one is equal to its weight on the earth? (k = 1/4 0 = 9.0 × 109 N m2/C2,e = 1.6 × 10-19 C,mproton = 1.67 × 10-27 kg)

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Chapter 16: The Electric Field

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Sample Questions

Q1) An ideal parallel-plate capacitor has a capacitance of C.If the area of the plates is doubled and the distance between the plates is halved,what is the new capacitance?

A)C/4

B)C/2

C)2C

D)4C

Q2) Two tiny particles having charges +20.0 C and -8.00 C are separated by a distance of 20.0 cm.What are the magnitude and direction of the \(\vec { E }\) field midway between these two charges? (k = 1/4 0 = 9.0 × 109 N m2/C2)

A)25.2 × \(10^6\) N/C directed towards the negative charge

B)25.2 × \(10^6\) N/C directed towards the positive charge

C)25.2 × \(10 ^ { 5 }\) N/C directed towards the negative charge

D)25.2 × \(10 ^ { 5 }\) N/C directed towards the positive charge

E)25.2 × \(10^4\) N/C directed towards the negative charge

Q3) The potential difference between two square parallel plates is 4.00 V.If the plate separation is 6.00 cm and they each measure 1.5 m by 1.5 m,what is the magnitude of the \(\vec { E }\) field between the plates?

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Chapter 17: Dc Circuits

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Sample Questions

Q1) If a quantity you calculated has units of A s,what is that quantity?

A)potential

B)resistivity

C)resistance

D)capacitance

E)charge

Q2) A 5.0-V battery storing 43.0 kJ of energy supplies \(1.5 \mathrm {~A}\) of current to a circuit.How much energy does the battery have left after powering the circuit for \(1.0 \text { h.? }\)

A)16 kJ

B)27 kJ

C)43 kJ

D)41 kJ

Q3) A 200- resistor is rated at 1/4 W.What is the maximum current it can safely draw?

A)0.035 A

B)0.35 A

C)50 A

D)0.25 A

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Chapter 18: Magnetism

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Sample Questions

Q1) 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

Q2) A long,straight,horizontal wire carries current toward the east.A proton moves toward the east alongside and just south of the wire.What is the direction of the magnetic force exerted on the proton?

A)toward the north

B)toward the south

C)upward

D)downward

E)toward the east.

Q3) A flat square coil of wire measures 9.5 cm on each side and contains 175 turns of very thin wire.It carries a current of 6.3 A in a uniform 0.84-T \(\vec { B }\) field.What angle less than 90° should the plane of this coil make with the \(\vec { B }\) field direction so that the magnitude of the magnetic torque exerted on it is 6.5 N m?

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Chapter 19: Electromagnetic Induction

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Sample Questions

Q1) A constant uniform magnetic field of 0.50 T is applied at right angles to the plane of a flat rectangular loop of area 3.0 × \(10^{ - 3}\) \(m ^ { 2 }\) If the area of this loop changes steadily from its original value to a new value of 1.6 × 10-3 m2 in 1.6 s,what is the emf induced in the loop?

A)1.6 × \(10 ^{- 2}\) V

B)0 V

C)7.5 × \(10^{ - 2}\) V

D)4.4 × \(10^{ - 4}\) V

E)9.0 × \(10 ^{- 2}\) V

Q2) A transformer is a device used to

A)transform an alternating current into a direct current.

B)transform a direct current into an alternating current.

C)increase or decrease an ac voltage.

D)increase or decrease a dc voltage.

Q3) A flat coil is in a uniform magnetic field.The magnetic flux through the coil is greatest when the plane of its area is

A)parallel to the magnetic field.

B)at 45° with the magnetic field.

C)perpendicular to the magnetic field.

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Page 21

Chapter 20: Vibrational Motion

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Sample Questions

Q1) An object attached to a spring undergoes SHM.When the object is at its maximum distance from the equilibrium position,which of the following statements are true? (There could be more than one correct choice.)

A)The object's acceleration is zero.

B)The object's speed is zero.

C)The elastic potential energy of the system object-spring is zero.

D)The kinetic energy of the system object-spring is a maximum.

E)The total mechanical energy of the system object-spring is zero.

Q2) A 1.15-kg beaker (including its contents)is placed on a vertical spring scale.When the system is sent into vertical vibrations,it obeys the equation y = (2.3 cm)cos(17.4 s-1 t).What is the spring constant of the spring scale,assuming it to be ideal?

Q3) Suppose you want to set up a simple pendulum with a period of 2.50 s.How long should it be

(a)on Earth,at a location where g = 9.80 m/s2? (b)on a planet where g is 5.00 times what it is on Earth?

Q4) If a pendulum makes 12 complete swings in 8.0 s,what are its (a)frequency and (b)period?

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Chapter 21: Mechanical Waves

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Sample Questions

Q1) A rope with a total mass of 25.0 kg is tied to a tree on one side of a 125-m wide ravine.You are pulling on the other end of the rope with a force of 415 N.If you pluck the rope at your end,how long will it take the pulse to travel across the ravine to the tree?

Q2) A factory siren indicating the end of a shift has a frequency of 80 Hz where the speed of sound in air is 343 m/s.What frequency is perceived by the occupant of a car that is traveling at 30 m/s (a)towards the factory and (b)away from the factory?

Q3) Two loudspeakers placed 6.00 m apart are driven in phase by an audio oscillator having a frequency range from 1908 Hz to 2471 Hz.A point P is located 4.70 m from one loudspeaker and 3.60 m from the other speaker.At what frequency of the oscillator does the sound reaching point P interfere constructively? The speed of sound is 344 m/s.

A)2190 Hz

B)2420 Hz

C)2110 Hz

D)2340 Hz

E)2270 Hz

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Chapter 22: Reflection and Refraction

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Sample Questions

Q1) A beam of light,traveling in air,strikes a plate of transparent material at an angle of incidence of 56.0°.It is observed that the reflected and refracted beams form an angle of 90.0°.What is the index of refraction of this material?

A)1.40

B)1.43

Q2) A scuba diver is 1.2 m beneath the surface of a still pond of water.At what angle relative to the normal at the surface must the diver shine a beam of light toward the surface in order for a person on a distant bank to be able to see it? The index of refraction for water is 1.33.

A)41°

B)48°

C)59°

D)90°

E)0°

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Chapter 23: Mirrors and Lenses

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Sample Questions

Q1) A seed is 15 mm in front of a convex lens,and the image of the seed is 4.0 mm behind the lens.What is the focal length of the lens?

A)11 mm

B)5.5 mm

C)3.8 mm

D)3.2 mm

Q2) A 4.0-cm-tall object is placed 50.0 cm from a concave lens having a focal length of magnitude 25.0 cm.What is the nature and location of the image?

A)A real image, 4.0 cm tall, 20 cm other side of the object

B)A virtual image, 4.0 cm tall, 20 cm other side of the object

C)A virtual image, 2.0 cm tall, 10 cm other side of the object

D)A virtual image, 1.3 cm tall, 16.7 cm same side as the object

E)A real image, 1.3 cm tall, 16.7 cm same side as the object

Q3) Nearsightedness is usually corrected with A)convex lenses.

B)concave lenses.

C)convex mirrors.

D)cylindrical lenses.

E)concave mirrors.

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Page 25

Chapter 24: Wave Optics

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Sample Questions

Q1) In a single-slit diffraction experiment,the width of the slit through which light passes is reduced.What happens to the width of the central bright fringe in the resulting diffraction pattern?

A)It stays the same.

B)It becomes narrower.

C)It becomes wider.

Q2) Light having a frequency in vacuum of 6.0 × 1014 Hz enters a liquid of refractive index 2.0.What is the frequency of the light in this liquid? (c = 3.0 × 108 m/s)

A)12 × 1014 Hz

B)6.0 × 1014 Hz

C)3.0 × 1014 Hz

D)1.5 × 1014 Hz

E)2.0 × 1014 Hz

Q3) Consider an experiment using a grating with 7000 lines/cm,a screen 2.50 m away,and a \(440 - n m\) wavelength beam of light.

(a)How many side maxima will be observed on one side of the central maximum?

(b)How far apart on the screen are the first-order and second-order maxima on the same side of the central maximum?

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Page 26

Chapter 25: Electromagnetic Waves

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Sample Questions

Q1) A radio station broadcasts at 80 MHz.How long does it take for this radio signal to travel a distance of \(2.0 \times 10 ^ { 7 } \mathrm {~m}\) through space? (c = 3.0 × 108 m/s)

A)0.15 × 10-2 s

B)15 ms

C)6.7 × 10-2 s

D)20 ms

E)25 ms

Q2) An 8.00-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.600 mm in diameter.What is the maximum value of the \(\vec { B }\) field in the laser beam? ( 0 = 8.85 × 10-12 C2/N m2, 0 = 4 × 10-7 T m/A,c = 3.0 × 108 m/s)

A)9.24 µT

B)17.2 µT

C)12.4 µT

D)20.5 µT

E)15.4 µT

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Chapter 26: Special Relativity

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Q1) A particle in a 799=m-long linear particle accelerator is moving at \(0.875 c\) How long does the particle accelerator appear to the particle?

A)387 m

B)1039 m

C)184 m

D)1651 m

Q2) A particle physicist observes cosmic rays creating a new particle high in the atmosphere,and the speed of this particle is measured at 99.7% the speed of light.It is unstable,and is observed to decay in an average 37.0 s.If this particle were at rest in the laboratory,what would be its average lifetime?

A)2.9 µs

B)18 µs

C)5.3 µs

D)12 µs

E)4.3 µs

Q3) A person in a rocket ship traveling past the earth at a speed of 0.500c fires a laser gun in the forward direction.With what speed does an observer on Earth measure for the light pulse?

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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) The work function of a certain metal is 1.90 eV.What is the longest wavelength of light that can cause photoelectron emission from this metal? (1 eV = 1.60 × 10-19 J,c = 3.00 × 108 m/s,h = 6.626 × 10-34 J s)

A)231 nm

B)14.0 nm

C)62.4 nm

D)344 nm

E)654 nm

Q3) What is the momentum of a photon of light that has a wavelength of 480 nm? \(( h = 6.626 \times 10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } )\)

A)1.1 × \(10^{ - 27}\) kgm/s

B)2.2 × \(10^{ - 27}\) kgm/s

C)1.8 × \(10^{ - 27}\) kgm/s

D)1.4 × \(10^{ - 27}\) kgm/s

E)2.0 × \(10 ^{- 27}\) kgm/s

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Chapter 28: Atomic Physics

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Q1) If a hydrogen atom originally in a state with principal quantum number n is excited to state n' = 2n,then

A)its radius and binding energy will double.

B)its radius will quadruple and the binding energy will double.

C)its radius will double and the binding energy will quadruple.

D)its radius will quadruple and the binding energy will be reduced by a factor of four.

E)its radius and binding energy will quadruple.

Q2) How many values of the magnetic quantum number,m,are possible if the orbital angular momentum quantum number is = 2?

A)1

B)2

C)3

D)4

E)5

Q3) What would be the de Broglie wavelength for 1-g object moving at the earth's escape speed 25,000 mph (about 11 km/s)? (h = 6.626 × 10-34 J s)

Q4) What is the energy (in electron-volts)of the n = 3 state of atomic hydrogen?

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Chapter 29: Nuclear Physics

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Q1) Plutonium has a half life of 2.4 × 104 years.How long does it take for 99.0% of the plutonium to decay?

A)1.6 × 102 y

B)1.6 × 103 y

C)1.6 × 104 y

D)1.6 × 105 y

E)1.6 × 106 y

Q2) The symbol for a certain isotope of radium is \(^{226} _{88} Ra\).How many nucleons are there in the nucleus of this isotope?

A)88

B)138

C)214

D)226

E)314

Q3) A gamma ray is also known as

A)an electron.

B)a positron.

C)a helium nucleus.

D)a high-energy photon.

Q4) How many protons,neutrons,and nucleons are there in a carbon-14 nucleus?

Page 31

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Chapter 30: Particle Physics

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Q1) How many quarks are in a deuteron, \({}^{2}_{1}\) H?

A)2

B)3

C)4

D)6

E)9

Q2) An electron and a positron,both essentially at rest,annihilate each other,emitting two identical photons in the process.What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg.(h = 6.626 × 10-34 J s,c = 3.00 × 108 m/s)

A)1.21 × 10-12 pm

B)1.73 pm

C)2.42 pm

D)3.07 pm

E)3.46 pm

Q3) What combination of quarks produces a proton and what are the electric charges on these quarks,expressed in terms of e?

Q4) What combination of quarks produces a neutron and what are the electric charges on these quarks,expressed in terms of e?

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