Deck 8: Waves-Sound and Light

Question 1

The Doppler effect is characteristic of

A)water waves.
B)sound waves.
C)light waves.
D)all of the above
E)none of the above

Answer 1

D

Question 2

The vibrations of a longitudinal wave move in a direction

A)along the direction of wave travel.
B)at right angles to the direction of wave travel.

Answer 2

A

Question 3

The period of the second hand on a clock is

A)1 s.
B)1/60 s.
C)60 s.
D)3600 s.
E)12 h.

Answer 3

C

Question 4

Wave interference occurs for

A)sound waves.
B)light waves.
C)water waves.
D)all of the above
E)none of the above

Question 5

A 60 vibration per second wave travels 30 m in 1 s. Its frequency is

A)30 Hz and it travels at 60 m/s.
B)60 Hz and it travels at 30 m/s.
C)neither A nor B

Question 6

How many vibrations per second are associated with a 101-MHz radio wave?

A)less than 101,000,000
B)101,000,000
C)more than 101,000,000

Question 7

A floating leaf oscillates up and down two complete cycles in 1 s as a water wave passes by. The wave's wavelength is 10 m. What is the wave's speed?

A)2 m/s
B)10 m/s
C)20 m/s
D)40 m/s
E)more than 40 m/s

Question 8

The vibrations of a transverse wave move in a direction

A)along the direction of wave travel.
B)at right angles to the direction of wave travel.

Question 9

Which of the following is not a transverse wave?

A)sound
B)light
C)radio
D)all of the above
E)none of the above

Question 10

The frequency of the second hand on a clock is

A)1 Hz.
B)1/60 Hz.
C)60 Hz.

Question 11

A mass on the end of a spring bobs up and down 1 complete cycle every 2 s. Its frequency is

A)0)5 Hz.
B)2 Hz.
C)neither A nor B

Question 12

If the frequency of a certain wave is 10 Hz, its period is

A)0)1 s.
B)10 s.
C)100 s.
D)none of the above

Question 13

Unlike a transverse wave, a longitudinal wave has no

A)amplitude.
B)frequency.
C)wavelength.
D)speed.
E)all of the above

Question 14

A wave travels an average distance of 6 m in 1 s. What is the wave's velocity?

A)less than 0.2 m/s
B)1 m/s
C)3 m/s
D)6 m/s
E)more than 6 m/s

Question 15

A wave travels an average distance of 1 m in 1 s with a frequency of 1 Hz. Its amplitude is

A)less than 1 m.
B)1 m.
C)more than 1 m.
D)not enough information given

Question 16

The source of all wave motion is a

A)wave pattern.
B)harmonic object.
C)vibrating object.
D)region of variable high and low pressure.
E)none of the above

Question 17

A wiggle in time is a

A)vibration.
B)wave.
C)both A and B
D)neither A nor B

Question 18

A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency?

A)0)5 Hz
B)1 Hz
C)2 Hz
D)3 Hz
E)6 Hz

Question 19

In a longitudinal wave, the compressions and rarefactions travel in

A)the same direction.
B)opposite directions.
C)neither A nor B

Question 20

The Doppler effect occurs when a source of sound moves

A)toward you.
B)away from you.
C)both A and B
D)none of the above

Question 21

A weight on an end of a spring bobs up and down one complete cycle every 2 s. Its frequency is

A)0)5 Hz.
B)1 Hz.
C)2 Hz.
D)none of the above

Question 22

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 MHz is

A)0)3 m.
B)3)0 m.
C)30 m.
D)300 m.
E)none of the above

Question 23

The source of all sounds is something that is

A)vibrating.
B)moving.
C)accelerating.
D)undergoing simple harmonic motion.
E)a net emitter of energy.

Question 24

At a concert, a wind blows directly from the orchestra toward you. Consequently, the wavelength of the sound you hear will be

A)decreased.
B)increased.
C)neither decreased nor increased.

Question 25

A weight on the end of a spring bobs up and down one complete cycle every 2 s. Its period is

A)0)5 s.
B)1 s.
C)2 s.
D)none of the above

Question 26

As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 m long. What is the speed of the wave?

A)0)25 m/s
B)0)50 m/s
C)1)0 m/s
D)2 m/s
E)4 m/s

Question 27

A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 m in 1 s, its wavelength is

A)0)5 m.
B)1 m.
C)2 m.
D)3 m.
E)6 m.

Question 28

Your favorite song will sound the loudest

A)in your air-filled room.
B)underwater.
C)in outer space.
D)behind a wall.

Question 29

A floating object oscillates up and down two complete cycles in 1 s as a water wave of wavelength 5 m passes by. The speed of the wave is

A)2 m/s.
B)5 m/s.
C)10 m/s.
D)15 m/s.
E)none of the above

Question 30

A weight suspended from a spring bobs up and down over a distance of 1 m in 2 s. Its frequency is

A)0)5 Hz.
B)1 Hz.
C)2 Hz.
D)none of the above

Question 31

A skipper on a boat notices wave crests passing the anchor chain every 5 s. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves?

A)3 m/s
B)5 m/s
C)15 m/s
D)not enough information given

Question 32

If at a concert, a wind blows directly from the orchestra toward you, the frequency of the sound you hear will be

A)decreased.
B)increased.
C)neither decreased nor increased.

Question 33

For light, a red shift indicates the light source moves

A)toward you.
B)away from you.
C)at right angles to you.
D)actually, all of the above
E)none of the above

Question 34

Some of a wave's energy dissipates as heat. In time, this will reduce the wave's

A)speed.
B)wavelength.
C)amplitude.
D)frequency.
E)period.

Question 35

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves

A)shortens.
B)lengthens.
C)stays the same.

Question 36

If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be

A)decreased.
B)increased.
C)neither decreased nor increased.

Question 37

If you double the frequency of a vibrating object, its period

A)doubles.
B)halves.
C)is quartered.

Question 38

What is the approximate range for human hearing?

A)ten to one-hundred Hertz
B)twenty to twenty-thousand Hertz
C)ninety to ninety-thousand Hertz
D)one-hundred to one million Hertz

Question 39

During a single period, the distance traveled by a wave is

A)one-half wavelength.
B)one wavelength.
C)two wavelengths.

Question 40

The amplitude of a particular wave is 1 m. The top to bottom distance of the disturbance is

A)0)5 m.
B)1 m.
C)2 m.
D)none of the above

Question 41

We are best at hearing

A)infrasonic sound.
B)ultrasonic sound.
C)both A and B
D)neither A nor B

Question 42

The explanation for refraction must involve a change in

A)frequency.
B)wavelength.
C)speed.
D)all of the above
E)none of the above

Question 43

Compressions and rarefactions are characteristic of

A)longitudinal waves.
B)transverse waves.
C)both A and B
D)neither A nor B

Question 44

Sound waves cannot travel in

A)air.
B)water.
C)steel.
D)a vacuum.
E)They can travel in all of the above.

Question 45

Sound travels faster in

A)air.
B)water.
C)steel.
D)a vacuum.
E)about the same speed in all of the above

Question 46

Refraction of sound can occur in

A)air.
B)water.
C)both A and B
D)neither A nor B

Question 47

The energy of sound in air eventually becomes

A)increased internal energy of the air.
B)weaker and weaker until it disappears.
C)cancelled by destructive interference.
D)cancelled by both destructive and constructive interference.

Question 48

Sound will be louder if a struck tuning fork is held

A)in the air.
B)with its base against a table top.
C)with its prongs in shallow water.
D)same in all these cases

Question 49

A sound wave is a

A)longitudinal wave.
B)transverse wave.
C)standing wave.
D)shock wave.
E)none of the above

Question 50

Compressions and rarefactions normally travel in

A)the same direction in a wave.
B)opposite directions in a wave.

Question 51

When the speed of sound near the ground is greater than higher in the air, sound tends to be bent

A)upward.
B)downward.

Question 52

The speed of a sound wave in air depends on

A)its frequency.
B)its wavelength.
C)the air temperature.
D)all of the above
E)none of the above

Question 53

Sound travels faster in air if the air is

A)warm.
B)cold.
C)neither warm nor cold.

Question 54

The least amount of energy is required to produce forced vibration in an object

A)below its natural frequency.
B)at its natural frequency.
C)above its natural frequency.

Question 55

Enrico Caruso, a famous opera singer, is said to have made a crystal chandelier shatter with his voice. This is a demonstration of

A)an echo.
B)sound refraction.
C)beats.
D)resonance.
E)interference.

Question 56

In designing a music hall, an acoustical engineer deals mainly with

A)modulation.
B)forced vibrations.
C)resonance.
D)beats.
E)wave interference.

Question 57

A sound source of high frequency emits a high

A)speed.
B)amplitude.
C)pitch.
D)all of the above
E)none of the above

Question 58

A wave having a frequency of 1000 Hz vibrates at

A)less than 1000 cycles per second.
B)1000 cycles per second.
C)more than 1000 cycles per second.

Question 59

A bass fiddle is louder than a harp because of its

A)thicker strings.
B)sounding board.
C)lower pitch.
D)all of the above
E)none of the above

Question 60

Double the frequency of sound and you also double its

A)wavelength.
B)speed.
C)amplitude.
D)all of the above
E)none of the above

Question 61

Most of the electromagnetic spectrum consists of visible light.

A)True
B)False

Question 62

Relative to ultraviolet waves, the wavelength of infrared waves is

A)shorter.
B)longer.
C)the same.

Question 63

If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a

A)period of 1000 s.
B)speed of 1000 m/s.
C)wavelength of 1000 m.
D)frequency of 1000 Hz.
E)wavelength of 1000 km.

Question 64

The source of all electromagnetic waves is

A)heat.
B)magnetic fields.
C)electric fields.
D)vibrating charges.
E)none of the above

Question 65

Resonance can be looked at as forced vibration with the

A)least amount of energy input.
B)maximum amount of energy input.
C)matching of wave amplitudes.
D)matching of constructive and destructive interference.
E)minimum beat frequency.

Question 66

The source of all electromagnetic waves is

A)changes in atomic energy levels.
B)vibrating atoms.
C)accelerating electric charges.
D)crystalline fluctuations.
E)none of the above

Question 67

The natural frequency of the atoms in glass is in the

A)infrared part of the spectrum.
B)visible part of the spectrum.
C)ultraviolet part of the spectrum.

Question 68

Which doesn't belong to the same family?

A)infrasonic waves
B)ultrasonic waves
C)radio waves
D)shock waves
E)longitudinal waves

Question 69

Relative to radio waves, the velocity of visible light waves in a vacuum is

A)less.
B)more.
C)the same.

Question 70

Which of these electromagnetic waves has the shortest wavelength?

A)radio waves
B)infrared waves
C)X rays
D)ultraviolet waves
E)light waves

Question 71

What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz?

A)less than 1 m
B)1 m
C)more than 1 m

Question 72

If an electric charge is shaken up and down,

A)sound is emitted.
B)light is emitted.
C)electron excitation occurs.
D)a magnetic field is created.
E)its mass decreases.

Question 73

Electromagnetic waves consist of

A)compressions and rarefactions of electromagnetic pulses.
B)vibrating electric and magnetic fields.
C)particles of light energy.
D)high-frequency gravitational waves.

Question 74

High-pitched sound has a high

A)speed.
B)frequency.
C)number of partial tones.
D)all of the above
E)none of the above

Question 75

When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of that radio station. In so doing, you are employing the principle of

A)forced vibrations.
B)resonance.
C)beats.
D)reverberation.
E)wave interference.

Question 76

If the Sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes

A)for the Sun to disappear.
B)to operate receiving equipment in the dark.
C)for light to travel from the Sun to Earth.
D)all of the above
E)none of the above

Question 77

Sound waves can interfere with one another so that no sound results.

A)True
B)False

Question 78

What is the wavelength of an electromagnetic wave that has a frequency of 3 kHz?

A)less than 1 km
B)1 km
C)more than 1 km

Question 79

What is the frequency of an electromagnetic wave that has a wavelength of 300,000 km?

A)less than 1 Hz
B)1 Hz
C)more than 1 Hz

Question 80

The main difference between a radio wave and a light wave is its

A)speed.
B)wavelength.
C)frequency.
D)all of the above
E)two of these