1. Sound

2. Sonic boom 3. Supersonic 4. Ultrasonic 5. Cochlea

A. Faster than the speed of sound.

B. A wave caused by alternating high and low pressure.

C. The organ that detects sound waves.

D. A pressure wave caused by an object go ing faster than sound.

E. A sound higher than humans can hear.

1. Pitch

2. dB

3. Space

4. Loudness 5. v_s

A. Where there is no sound because of its vacuum.

B. How we hear changes of frequency of sound.

C. 340 m/s in air.

D. How we measure loudness.

E. The amplitude or strength of a sound.

_{Displacement(m})

Displacement vs. Position

5

4

3

2

1

0

-1

-2

-3

-4

-5

^{0 0.}₅^{1 1.}₅^{2 2.}₅^{3 3.}₅^{4 4.}₅5Position (m)

Use the graph to answer these questions:= _______________ 1 cycle is from 1 m to _________; 1/2 cycle is from 0 m to ________. Amplitude (A) = _________________ Total cycles: _________; It is a sound wave; find frequency:

Is this frequency audible to humans (can we hear it)?

A wave's velocity is 90 m/sec with a frequency of 6 Hz. What is it's wavelength?

A sound wave has a wavelength of 20 m. Find its frequency.

If a sound wave's frequency is 100 Hz. What is its period? What is the above wave's wavelength?

A railroad crew is repairing a rail. You hear the hammer 0.5 se conds after it is swung. How far away is the crew?

Why is space silent?

If I increase the energy I give a sound wave what changes:

If a wave's fourth harmonic has a frequency of 40 Hz, what is its natural frequency and what is the frequency of H₆?

If a wave's fundamental is 6 Hz, what harmonic has a frequency of 48 Hz?

You hear a plane 4 seconds after you see it. Find the distance to the plane.

If a sound is 40 dB loud. Answer how many dB these would be: 1) A sound twice as loud:

2) A sound half as loud:

Compared to a 50 dB sound, you would hear a 60 dB as:

Find its period:

What harmonic is this?

Could a human hear this frequency? Mark the nodes and anti-nodes. How many wavelengths is it?

What is its wavelength?

Find the fundamental frequency:

5th harmonic frequency:

Speed of the wave on this string:

80 Hz

6 m