PHS 1060 Homework Ch 10

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

0.1 s

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

0.31 Hz

A wave having a frequency of 1000 Hz vibrates at

1000 cycles per second

The range of human hearing is about

20 Hz to 20,000 Hz

How do dolphins perceive their environment in dark and murky water?

Dolphins "see" with sound, using sonar to bounce sound off objects in the water

Distinguish between these parts of a wave: period, amplitude, wavelength, and frequency.

Period: time between identical portions in waves. Amplitude: distance between midpoint and crest. Wavelength: distance between identical portions in waves. Frequency: how often a vibration occurs.

When the bug that is creating waves swims forward, how does the frequency of the wave some distance away behind the bug compare with the frequency produced by a stationary bug?

The frequency of the wave some distance away behind the bug is less than the frequency of the wave produced by a stationary bug.

When the bug that is creating waves swims forward, how does the frequency of the wave some distance away in front of the bug compare with the frequency of the wave produced by a stationary bug?

The frequency of the wave some distance away in front of the bug is greater than the frequency produced by a stationary bug.

When the bug is stationary and creating waves, how does the frequency of the wave some distance away from the bug compare with the frequency of the vibration of the bug?

The frequency of the wave some distance away is equal to the frequency of the vibration of the bug.

When the bug that is creating waves swims in the direction of the waves, how does the speed of the wave some distance away in front of the bug compare with the speed of the wave created by a stationary bug?

The speed of the wave some distance away is equal to the speed of the wave due to a stationary bug.

Sound waves cannot travel in

a vacuum

The vibrations of a transverse wave move in a direction

at right angles to the direction of wave travel.

Can the Doppler effect be observed with longitudinal waves, transverse waves, or both?

both

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

have shorter wavelengths.

Sound travels fastest in

ice.

If you quickly run toward the orchestra at a concert, the frequency of the sound you hear will be

increased.

Compressions and rarefactions are characteristic of

longitudinal waves

Infrasonic sound waves have relatively

low frequencies and long wavelengths

A sound source of high frequency emits a high

pitch

What is a reverberation?

reverberation is sound with multiple reflections

Which of the following is not a transverse wave?

sound

What is the law of reflection for sound?

the angle of incidence equals the angle of reflection

A wave is a vibration in

time and space

The medium in which a wave travels

transmits the wave

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

upward.

What is the source of all waves?

vibration