Physics chapter 10

Wave interference occurs for a. water waves sound waves light waves all of the above none of the above

-light waves. -sound waves. -water waves. -*all of the above

The natural frequency of an object depends on its a. elasticity size and shape both neither

-size and shape. -elasticity. -*both

The Doppler effect is characteristic of a. sound waves light waves water waves all of the above none of the above

-sound waves. -water waves. -light waves. -*all of the above

A dolphin perceives its environment by the sense of a. sound sight both neither

-sound. -sight. -*both

A wave is a vibration in time space both neither

-space. -time. -*both

Rank the pitches heard, from highest to lowest. The siren of a fire engine is heard in three situations: when the fire engine is traveling -toward the listener at 30 km/h -toward the listener at 50 km/h -away from the listener at 20 km/h

-toward the listener at 50 km/h -toward the listener at 30 km/h -away from the listener at 20 km/h

A Doppler effect occurs when a source of sound moves a. toward you away from you either neither

-toward you. -away from you. -*either

Sound energy that is not reflected is a. transmitted absorbed either or both

-transmitted. -absorbed. -*either or both

In perceiving its environment, a dolphin makes use of a. ultrasound the Doppler effect echoes all of the above none of the above

-ultrasound. -the Doppler effect. -echoes. -*all of the above

Refraction of sound can occur in water air both neither

-water. -air. -*both

If the frequency of a certain wave is 10 Hz, its period is a. 0.1 s 10s 100s none of the above

.1 S

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 2 Hz neither

.5 Hz

A weight suspended from a spring bobs up and down one complete cycle every 2 s. Its frequency is a. 1 Hz 2 Hz 0.5 Hz None of the above

.5 Hz

A 340-Hz sound wave travels at 340 m/s in air with a wavelength of a. 10 m 1 m 1000 m 100 m none of the above

1 m

The frequency of the second hand on a clock is a. 60 Hz 1 Hz 1/60 Hz

1/60 Hz.

A wave having a frequency of 1000 Hz vibrates at a. more than 1000 cycles per second 1000 cycles per second less than 1000 cycles per second

1000 cycles per second.

How many vibrations per second are associated with a 101-MHz radio wave? a. less than 101000000 more than 101000000 101000000

101,000,000

Suppose you sound a 1056-Hz tuning fork when you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string? a. 1059 Hz 1053 1056 1054 1058

1059 Hz

A floating leaf oscillates up and down two complete cycles each 1 s as a water wave passes by. What is the wave's frequency? a. 0.5 Hz 3 Hz 6 Hz 1 Hz 2 Hz

2 Hz

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.1.0 m/s 4 m/s .25 m/s .50 m/s 2 m/s

2 m/s

A weight suspended from a spring bobs up and down one complete cycle every 2 s. Its period is a. 2s 1s 0.5s none of the above

2 s

The range of human hearing is about a. 20 Hz - 20,000 Hz. 40 Hz - 40,000 Hz 10 Hz - 10,000 Hz all of the above, depending on the person

20 Hz - 20,000 Hz.

A floating leaf oscillates up and down 2 complete cycles in 1 s as a water wave of wavelength 10 m passes by. What is the wave's speed? a. 40 m/s 20 m/s more than 40 m/s 2 m/s 10 m/s

20 m/s

Resonance occurs when a 200-Hz tuning fork encounters a sound wave with a frequency of a. 300 Hz 150 Hz 200 Hz any of the above none of the above

200 Hz

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. 2295 m 3060 m 1530 m 4590 m

2295 m

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 4 3 5 none of the above

3

A wave oscillates up and down two complete cycles each 1 s. If the wave travels an average distance of 6 m in 1 s, its wavelength is a. 6 m 3m 0.5 m 1 m 2 m

3 m

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 15 m/s 5 m/s not enough info

3 m/s

Two tuning forks produce sounds of wavelengths 3.4 m and 3.3 m. What beat frequency is produced? a. .1 Hz 3 Hz 1 Hz 4 Hz 2 Hz

3.0 Hz

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 3.0 m 300 m 30 m none of the above

3.0 m

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 340 m 170 m

340 m

A tuning fork produces a sound with a frequency of 256 Hz and a wavelength in air of 1.33 m. Find the speed of sound in the vicinity of the fork.

340 m/s

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. 30 s 400 s .25 s 4.0 s

4.0 s

In Europe an electric razor completes 50 vibrations in 1 s. The frequency of these vibrations is a. 1/50 Hz with a period of 50 s 50 Hz with a period of 1/50 s 1/50 Hz with a period of 1/50s 50 Hz with a period of 50 s

50 Hz with a period of 1/50 s.

What beat frequency is produced when a 240-Hz and a 246-Hz tuning fork are sounded together? a. 240 Hz 245 Hz 6 Hz 12 Hz none of the above

6 Hz

A wave travels an average distance of 6 m in 1 s. What is the wave's velocity? a. more than 6 m/s less than 0.2 m/s 1 m/s 6 m/s 3 m/s

6 m/s

A 60 vibration per second wave travels 30 m in 1 s. Its frequency is a. 60 Hz and it travels at 30 m/s 30 Hz and it travels at 60 m/s neither

60 Hz and it travels at 30 m/s.

The period of the second hand on a clock is a. 3600s 12 h 1s 60s 1/60s

60 s

Rank the speed of sound through the following media from fastest to slowest: Air, Steel, Water

Steel, water, air

A railroad locomotive is at rest with its whistle shrieking, and then it starts moving toward you. Does the frequency that you hear increase, decrease, or stay the same? a. the frequency decreases the frequency increases the frequency stay the same

The frequency increases

How about the speed of sound in the air between you and the locomotive? a. the speed decreases the speed increases the speed is unchanged

The speed is unchanged.

How about the wavelength reaching your ear? a. the wavelength increases the wave length decreases the wave length stay the same

The wavelength decreases.

Sound waves cannot travel in a. air a vacuum water steel

a vacuum

A standing wave occurs when a. two waves overlap a wave reflects upon itself the amplitude of a wave exceeds its wavelength the speed of the wave is zero or near zero

a wave reflects upon itself

The vibrations of a longitudinal wave move in a direction a. along the direction of wave travel at right angles to the direction of wave travel opposite to wave travel

along the direction of wave travel.

A sonic boom can NOT be produced by a. a whip a speeding bullet an aircraft flying slower than the speed of sound all of the above

an aircraft flying slower than the speed of sound.

The reflection of sound is a. an echo reverberation bouncing waves

an echo

The least amount of energy is required to produce forced vibration in an object a. above its natural frequency below its natural frequency at its natural frequency

at its natural frequency.

The vibrations of a transverse wave move in a direction a. at right angles to the direction of wave travel along the direction of wave travel opposite to wave travel

at right angles to the direction of wave travel.

For light, a red shift indicates the light source moves a. at right angles to you toward you away from you all of the above none of the above

away from you

When sound travels faster higher above ground level than it does closer to the ground, sound bends a. upward downward neither

downward

What moves from place to place in wave motion is a.momentum pressure matter energy

energy

A shock wave is produced when the speed of an object a. is less than the speed of sound in air matches the speed of sound in air exceeds the speed of sound in air none of the above

exceeds the speed of sound in air.

A bow wave is produced in water when the speed of an object a. exceeds the speed of waves in water is less than the speed of waves in water matches the speed of waves in water none of the above

exceeds the speed of waves in water.

A pendulum swings to and fro every 3.2 s . Find its frequency of swing.

f = 0.31 Hz

When we consider how frequently a pendulum swings to and fro we're talking about its amplitude period frequency wavelength

frequency

Sound travels fastest in a. ice water water vapor

ice

Compressions and rarefactions normally travel a. in the same direction in a wave in opposite directions in a wave at right angles to the wave none of the above

in the same direction in a wave.

While at a concert, a wind blows directly from the orchestra toward you. The speed of the sound you hear is a. increased decreased neither

increased

The phenomenon of beats results from sound a. interference refraction reflection all of the above none of the above

interference

If you double the frequency of a vibrating object, its period a. is half doubles is one quarter

is half

A sound wave is a a. longitudinal wave transverse wave standing wave shock wave none of the above

longitudinal wave.

Compressions and rarefactions are characteristic of a. transverse waves longitudinal waves both neither

longitudinal waves

A wave barrier is produced in water when the speed of an object a. exceeds the speed of waves in water is less than the speed of waves in water matches the speed of waves in water none of the above

matches the speed of waves in water.

A node is a position of a. maximum amplitude minimum amplitude neither

minimum amplitude

An explosion occurs 34 km away. For sound that travels at 340 m/s, you'll hear the explosion in a. more than 20 s 0.1 s 10 s 20 s 1 s

more than 20 s.

Double the frequency of sound and you also double its a. amplitude wavelength speed all of the above none of the above

none of the above

A wave travels an average distance of 1 m in 1 s with a frequency of 1 Hz. Its amplitude is a. more than 1 m less than 1 m 1 m not enough info

not enough information

During a single period, the distance traveled by a wave is a. one-half wavelength one wavelength two wavelengths

one wavelength.

When we consider the time taken for a pendulum to swing to and fro we're talking about the pendulum's a. period frequency wavelength amplitude

period

A sound source of high frequency emits a high a. speed amplitude pitch all of the above none of the above

pitch

Which doesn't belong to the same family? a. shock waves ultrasonic waves infrasonic waves longitudinal waves radio waves

radio waves

Reverberation is a case of a. resonance forced vibrations re-echoed sound sound interference none of the above

re-echoed sound.

Some singers are able to shatter a crystal chandelier with their voice, which illustrates a. an echo sound refraction beats interference resonance

resonance

Troops break step when marching across a bridge to prevent a. resonance interference frequency distortion wave motion

resonance

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, which illustrates a. force vibrations beats resonance wave interference reverberation

resonance

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves a. remains the same shortens lengthens

shortens

When the handle of a tuning fork is held solidly against a table, the sound becomes louder and the time the fork keeps vibrating becomes a. remains the same shorter longer

shorter

Reverberation is a phenomenon you would likely to hear if you sing in the a. shower tundra desert

shower

The object with the natural frequency of higher pitch is a a. small bell large bell either neither

small bell

Which of the following is a longitudinal wave? a. light sound radio all of the above none of the above

sound

Which of the following is not a transverse wave? a. light sound radio all of the above none of the above

sound

A bass fiddle is louder than a harp because of its a. sounding board lower pitch thicker strings all of the above none of the above

sounding board

The explanation for all types of refraction involves a change in a. frequency period speed all of the above none of the above

speed

A compression is a squash and a rarefaction is a a. crunch stretch reverse tension

stretch

On days when the air nearest the ground is colder than air above, sound waves a. tend to be refracted upward tend to be refracted downward travel without refraction

tend to be refracted downward.

The speed of a sound wave in air depends on a. the air temperature its frequency its wavelength all of the above none of the above

the air temperature.

In a longitudinal wave, the compressions and rarefactions travel in a. opposite directions the same direction neither

the same direction.

A Doppler effect occurs when a source of sound moves a. at right angles to you toward you both neither

toward you

The medium in which a wave travels a. transmits the wave moves along with the wave inhibits the wave reflects the wave

transmits the wave

Sound waves can interfere with one another so that no sound is produced. a. true false

true

When sound travels faster at ground level than higher in the air, sound tends to bend a. downward upward neither

upward

Find a wave speed of a certain .80-m-long wave with a frequency of 2.3 Hz .

v = 1.8 m/s

The source of all sounds is something that is a. moving accelerating vibrating undergoing simple harmonic motion

vibrating

The source of all wave motion is a a. region of variable high and low pressure wave pattern harmonic object vibration object none of the above

vibrating object

A wiggle in time is a a. vibration wave both neither

vibration

Sound travels faster when the air is a. warm cold neither

warm

In designing a music hall, an acoustical engineer is concerned with a. wave interference modulation resonance forced vibrations beats

wave interference.

The highest frequency sound humans can hear is about 20,000 Hz. What is the wavelength of sound in air at this frequency? What is the wavelength of the lowest sounds we can hear, about 20 Hz?

λ = 1.7 cm λ = 17 m

Knowing that the speed of sound in seawater is 1530 m/s, find the wavelength of a T wave.

λ = 219 m