Deck 10: Waves and Sound

Question 1

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 101,000,00
D)none of the above

Answer 1

B

Question 2

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 of these

Answer 2

A

Question 3

The vibrating system with the greatest frequency has the

A)shortest period.
B)longest period.
C)both of these
D)none of the above

Answer 3

A

Question 4

What moves from place to place in wave motion is

A)energy.
B)momentum.
C)pressure.
D)matter.

Question 5

When we consider the time for an oscillating system to make a vibration we're talking about

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

Question 6

When we consider the distance a pendulum swings to and fro we're talking about the pendulum's

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

Question 7

When we consider how frequently an oscillating system vibrates we're talking about

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

Question 8

The source of all wave motion is

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

Question 9

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

A)doubles.
B)is halved.
C)is one-quarter.

Question 10

A wiggle in time is a

A)vibration.
B)wave.
C)both of these
D)none of the above

Question 11

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.

Question 12

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

A)30 Hz.
B)60 Hz.
C)more than 60 Hz.
D)none of the above

Question 13

Wave speed and wave frequency are two terms that are

A)basically the same.
B)fundamentally different from each other.
C)opposites.
D)reciprocals.

Question 14

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.
D)none of the above

Question 15

A wave is a vibration in

A)space.
B)time.
C)both of these
D)none of the above

Question 16

The medium in which a wave travels

A)moves along with the wave.
B)transmits the wave.
C)inhibits the wave.
D)reflects the wave.

Question 17

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 18

A mass suspended from 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 19

The frequency of the second hand on a clock is

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

Question 20

An electric razor in Europe completes 50 vibrations in 1 s.The frequency of these vibrations is

A)50 Hz with a period of 1/50 s.
B)1/50 Hz with a period of 50 s.
C)50 Hz with a period of 50 s.
D)1/50 Hz with a period of 1/50 s.

Question 21

The vibrations of a transverse wave move in a direction

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

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

A floating leaf oscillates up and down twice in 1 s 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 24

A wave travels an average distance of 6 m in 1 s.What is the wave's average 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 25

The vibrations of a longitudinal wave move in a direction

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

Question 26

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

Question 27

A wave travels an average distance of 6 m in 0.5 s.What is the wave's average 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 28

Which of the following is a longitudinal wave?

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

Question 29

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

Question 30

A compression is a squash and a rarefaction is a

A)crunch.
B)reverse tension.
C)stretch.

Question 31

A floating leaf oscillates up and down twice in 1 s as a water wave of wavelength 10 m passes by.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 32

The compressions and rarefactions in a longitudinal wave travel in

A)the same direction.
B)opposite directions.
C)neither of these

Question 33

Bree dips a pair of prongs onto a water surface and produces waves.When she dips more frequently the resulting waves

A)have shorter wavelengths.
B)remain the same in wavelength.
C)have longer wavelengths.
D)move faster.
E)none of the above

Question 34

A boat at anchor is rocked by waves whose crests are 40 m apart and with wave speed 10 m/s.These waves reach the boat once every

A)400 s.
B)30 s.
C)4 s.
D)0.25 s.

Question 35

A succession of 2-m long water waves on a lake goes by a piece of floating cork that bobs up and down one complete cycle each second.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 36

A wave oscillates up and down twice in 1 s.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 37

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 38

Compressions and rarefactions travel

A)at right angles to the wave.
B)in the same direction of the wave.
C)in opposite directions of the wave.
D)none of the above

Question 39

Compressions and rarefactions are characteristic of

A)longitudinal waves.
B)transverse waves.
C)both of these
D)none of the above

Question 40

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

A)one-half wavelength.
B)one wavelength.
C)two wavelengths.
D)more information is needed

Question 41

A sound wave is a

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

Question 42

Sound travels faster in

A)air.
B)water.
C)steel.
D)a vacuum.
E)same in each

Question 43

Loudness of sound is most closely related to

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

Question 44

An explosion occurs 34 km away.For sound that travels at 340 m/s,you'll hear the explosion in

A)0.1 s.
B)1 s.
C)10 s.
D)20 s.
E)more than 20 s.

Question 45

The source of all sounds is something that is

A)accelerating.
B)moving.
C)vibrating.
D)undergoing simple harmonic motion.

Question 46

A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it,and dividing by

A)2.
B)3.
C)4.
D)5.
E)none of the above

Question 47

Our ears are best at hearing

A)infrasonic sound.
B)ultrasonic sound.
C)both of these
D)none of the above

Question 48

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 49

Sound travels fastest in

A)water vapor.
B)water.
C)ice.
D)same in all

Question 50

The range of human hearing is about

A)10 Hz - 10,000 Hz.
B)20 Hz - 20,000 Hz.
C)40 Hz - 40,000 Hz.
D)all of the above,depending on the person

Question 51

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 52

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 53

The speed of sound varies with

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

Question 54

A 340-Hz sound wave travels at 340 m/s in air with a wavelength of

A)1 m.
B)10 m.
C)100 m.
D)1000 m.
E)none of the above

Question 55

Ultrasonic sound waves have relatively

A)low frequencies.
B)long wavelengths.
C)both of these
D)none of the above

Question 56

For each 1-degree increase in temperature above 0°C,the speed of sound in air

A)decreases by 0.6 m/s.
B)increases by 0.6 m/s.
C)as with the speed of light,doesn't change.

Question 57

Sound travels faster when the air is

A)warm.
B)cold.
C)neither of these

Question 58

Compressions and rarefactions of sound waves normally travel

A)at different speeds.
B)in opposite directions.
C)at reduced frequencies.
D)all of the above
E)none of the above

Question 59

Infrasonic sound waves have relatively

A)low frequencies.
B)long wavelengths.
C)both of these
D)none of the above

Question 60

Sound waves cannot travel in

A)air.
B)water.
C)steel.
D)a vacuum.

Question 61

Some singers are able to shatter a crystal chandelier with their voice,which illustrates

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

Question 62

The explanation for all types of refraction involves a change in

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

Question 63

When sound travels faster higher in the air than it does closer to the ground,sound bends

A)upward.
B)downward.
C)neither of these

Question 64

The natural frequency of an object depends on its

A)elasticity.
B)size and shape.
C)both of these
D)none of the above

Question 65

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 66

Troops break step when marching across a bridge to prevent

A)interference.
B)resonance.
C)wave motion.
D)frequency distortion.

Question 67

"Sympathetic vibrations" refers to

A)beats.
B)interference.
C)pitch.
D)resonance.

Question 68

On days when the air nearest the ground is colder than air above,sound waves tend to

A)be refracted upward.
B)be refracted downward.
C)travel without refraction.

Question 69

Sound refraction depends on the speed of sound being

A)constant.
B)variable.
C)proportional to frequency.
D)inversely proportional to wavelength.
E)none of the above

Question 70

A bat chirps to locate a tasty lunch.The chirp travels at 340 m/s and its echo is heard 1 s after the chirp.Distance to the lunch is

A)85 m.
B)170 m.
C)340 m.

Question 71

An acoustical engineer designing a music hall is most concerned with

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

Question 72

Reverberation is a phenomenon you would be likely experience while singing in the

A)shower.
B)desert.
C)tundra.

Question 73

A dolphin perceives its environment by the sense of

A)sight.
B)sound.
C)both of these
D)none of the above

Question 74

Reverberation is a case of

A)sound interference.
B)forced vibrations.
C)re-echoed sound.
D)resonance.
E)none of the above

Question 75

The reflection of sound is

A)reverberation.
B)an echo.
C)a rare occurrence.

Question 76

The object with a natural frequency of higher pitch is a

A)small bell.
B)large bell.
C)either of these
D)none of the above

Question 77

Refraction of sound can occur in

A)air.
B)water.
C)both of these
D)none of the above

Question 78

When sound travels faster at ground level than higher in the air,sound tends to bend

A)upward.
B)downward.
C)neither of these

Question 79

Ultrasonic sound that travels at 1530 m/s in ocean water is bounced off the ocean floor and returns to the ship above.If the round trip takes 3 s,the depth of the water is

A)1530 m.
B)2295 m.
C)3060 m.
D)4590 m.

Question 80

Sound energy that is not reflected is

A)transmitted.
B)absorbed.
C)either or both of these