Ch. 12-14 Homework Problems

A

A 340-hertz sound wave travels at 340 m/s in air with a wavelength of?? A) 1m B) 10m C) 100m D) 1000m

B

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is A) 30 hertz and it travels at 60 m/s B) 60 hertz and it travels at 30 m/s C) 1800 hertz and it travels at 2 m/s

A

A Doppler effect occurs when a source of sound moves A) Toward you B) At right angles to you C) Both of these D) None of these

C

A Doppler effect occurs when a source of sound moves A) Towards you B) Away from you C) Either towards you or away from you D) In a circle around you

C

A common source of wave motion is a A) Wave pattern B) Harmonic object C) Vibrating object D) Region of variable high and low pressure E) None of these

C

A dolphin perceives its environment by the sense of A) Sight B) Sound C) Both sight and sound D) Neither sight or sound

C

A fishing-boat captain returns to port saying, "It's rough out there- the waves are 4 meters high." He probably means that the amplitude of the waves is A) 4 m B) 3 m C) 2 m D) 1 m

C

A floating leaf oscillates up and down 2 complete cycles each second as a water wave passes by. What is the wave's frequency?? A) 0.5 hertz B) 1 hertz C) 2 hertz D) 3 hertz E) 6 hertz

C

A floating leaf oscillates up and down 2 complete cycles in 1 second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed? A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s E0 More than 40 m/s

C

A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters 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 these

0.5 Hz

A kid on a playground swing makes a complete to-and-fro swing each 2 seconds. The frequency of swing is??

2 seconds

A kid on a playground swing makes a complete to-and-fro swing each 2 seconds. The period is??

1/8

A marine weather station reports waves along the shore that are 8 seconds apart. The frequency of the waves is therefore ____ hertz

A

A node is a position of A) Minimum amplitude B) Maximum amplitude C) half amplitude

A

A skipper on a boat notices waves crests passing the anchor chain every 5 seconds. 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

C

A sound source of high frequency emits a high A) Speed B) Amplitude C) Pitch D) All of these E) None of these

A

A sound wave is a A) Longitudinal Wave B) Transverse Wave C) Standing Wave D) Shock Wave E) None of the above choices are correct

B

A standing wave occurs when A) 2 waves overlap B) A wave reflects upon itself C) The speed of the wave is zero or near zero D) The amplitude of a wave exceeds its wavelength

The wavelength decreases as velocity is constant

A tennis-ball pitching machine goes haywire and pitches at 10 rounds per second. The speed of the balls is an incredible 300 m/s. What happens to the distance between the balls if the rate of pitching is increased??

30 m

A tennis-ball pitching machine goes haywire and pitches at 10 rounds per second. The speed of the balls is an incredible 300 m/s. What is the distance in the air between the flying balls??

B

A wave having a frequency of 1000 hertz vibrates at A) Less than 1000 cycles per second B) 1000 cycles per second C) More than 1000 cycles per second

D

A wave oscillates up and down 2 complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is A) 0.5 m B) 1 m C) 2 m D) 3 m E) 6 m

D

A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is A) Less than 1 meter B) 1 meter C) More than 1 meter D) Not enough information to say

D

A wave travels an average distance of 6 meters in 1 second. 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

A

A weight suspended from a spring bobs up and down over a distance of 1 meter in 2 seconds. Its frequency is A) 0.5 hertz B) 1 hertz C) 2 hertz D) None of the above choices are corrct

E

An explosion occurs 34 km away. Since sound travels at 340 m/s the time it takes for the sound to reach you is?? A) 0.1 s B) 1 s C) 10 s D) 20 s E) More than 20 s

A

An object that completes 10 vibrations in 20 seconds has a frequency of A) 0.5 hertz B) 2 hertz C) 200 hertz

D

An object that completes 100 vibrations in 5 seconds has a period of A) 0.5 second B) 1 second C) 2 seconds D) None of the above choices are correct

C

An object that completes 20 vibrations in 10 seconds has a frequency of A) 0.5 hertz B) 1 hertz C) 2 hertz D) 200 hertz

A

Compressions and rarefactions are characteristic of A) Longitudinal Waves B) Transverse Waves C) Both longitudinal and transverse waves D) Neither of the above choices are correct

A

Compressions and rarefactions normally travel in A) The same direction in a wave B) Opposite directions in a wave C) Directions that are at right angles to the wave direction

30 cm

Consider a wave generator that produces 10 pulses per second. The speed of the waves is 300 cm/s. What is the wavelength of the waves??

A

Double the frequency of a sound and you halve its A) Wavelength B) Speed C) Amplitude D) All of these E) None of these

E

Double the frequency of sound and you also double its A) Wavelength B) Speed C) Amplitude D) All of these E) None of these

B

During a single period, the distance traveled by a wave is A) One-half wavelength B) One wavelength C) 2 wavelengths

Wavelength

Frequency is inversely proportional with??

1/2 m/s

If the distance between crests were 1.5 m apart and 2 crests pass the pole each second, what would be the period of wave motion??

3 m/s

If the distance between crests were 1.5 m apart and 2 crests pass the pole each second, what would be the speed of the wave??

A

If the frequency of a certain wave is 10 hertz, its period is A) 0.1 second B) 10 seconds C) 100 seconds D) None of the above choices are correct

D

If waves are going by at the same speed, the wave with the greatest period of oscillation is the wave that has the greatest A) Amplitude B) Wavelength C) Frequency D) None of the above choices are true

B

If you double the frequency of a vibrating object, its period A) Doubles B) Halves C) Is quartered

A

In a longitudinal wave the compressions and rarefactions travel in A) The same direction B) Opposite directions C) A vacuum

A

Like a transverse wave, a longitudinal wave has A) Amplitude, frequency, wavelength and speed B) Amplitude, frequency and wavelength C) Amplitude, wavelength and speed D) Wavelength, speed and frequency E) Amplitude, frequency and speed

B

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is?? A) 0.3 m B) 3 m C) 30 m D) 300 m E) None of these

C

Refraction of sound can occur in A) Air B) Water C) Both air and water D) Neither air nor water

C

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

C

Sound travels faster in A) Air B) Water C) Steel D) A vacuum E) Sound travels at about the same speed in all of the above media

A

Sound travels faster in air if the air temperature is A) Warm B) Cold C) Average

A

Sound waves can interfere with one another so that no sound results A) True B) False C) Either true or false, depending on the air temperature D) Neither. Both may be of the same frequency

D

Sound waves cannot travel in A) Air B) Water C) Steel D) A vacuum E) Any of the above media

D

The Doppler effect is characteristic of A) Water waves B) Sound waves C) Light waves D) All of the above choices E) None of the above choices

C

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is A) 0.5 m B) 1 m C) 2 m D) None of these

600 Hz

The annoying sound from a mosquito is produced when it beats its wings at the average rate of 600 wingbeats per second. What is the frequency of the sound waves??

0.567 m

The annoying sound from a mosquito is produced when it beats its wings at the average rate of 600 wingbeats per second. What is the wavelength?? (Assume the speed of sound is 340 m/s)

B

The approximate range of human hearing is A) 10 hertz to 10,000 hertz B) 20 hertz to 20,000 hertz C) 40 hertz to 40,000 hertz

1/2 s

The bird at the right watches the waves. If the portion of a wave between 2 crests (1m) passes the pole each second, what is the period of wave motion??

2 m/s

The bird at the right watches the waves. If the portion of a wave between 2 crests (1m) passes the pole each second, what is the speed of the waves??

Wave Frequency

The changed pitch of the Doppler effect is due to changes in??

C

The explanation for refraction must involve a change in A) Frequency B) Wavelength C) Speed D) All of the above choices are true E) None of the above choices are true

E

The frequency of a simple pendulum depends on A) Its mass B) Its length C) The acceleration due to gravity D) All of these E) Two of these

B

The frequency of the second hand on a clock is A) 1 hertz B) 1/60 hertz C) 60 hertz

C

The pendulum with the greatest frequency is the pendulum with the A) Shortest period B) Shortest length C) Shortest period and the shortest length D) Shortest amplitude E) Greatest amplitude

1/440

The period of a 440-Hertz sound wave is ____ second

C

The period of the second hand on a clock is?? A) 1 second B) 1/60 seconds C) 60 seconds D) 3600 seconds E) 12 hours

A

The source of every sound is something that is A) Vibrating B) Moving C) Accelerating D) Undergoing simple harmonic motion E) A net emitter of energy

C

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 choices are correct E) None of the above choices are correct

A

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 C) That changes with speed

B

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 C) That changes with speed

D

Wave interference occurs for A) Sound waves B) Light waves C) Water waves D) All of the above choices are correct E) None of the above choices are correct

The wavelength decreases

What happens to the wavelength if the frequency of pulses is increased??

Low

When an automobile moves away from the listener, its horn seems ____ pitched

High

When an automobile moves toward a listener, the sound of its horn seems relatively ____ pitched

A

Which of the following is not a transverse wave? A) Sound B) Light C) Radio D) All of these E) None of these

A

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