Chapter 3

Question 1

The distance sound travels over time

Answer 1

Speed of sound

Question 2

What is the unit for speed of sound?

Answer 2

c= m/sec or ft/sec

Question 3

The distance traveled by a single cycle

Answer 3

Wavelength

Question 4

What is the formula for wavelength?

Answer 4

lambda= speed of sound divided by frequency

Question 5

What unit is wavelength measured in?

Answer 5

meter/cycle or ft/cycle

Question 6

The amount of time required to complete one cycle

Answer 6

Period

Question 7

What is period measured in?

Answer 7

sec/cycle

Question 8

How do you find period?

Answer 8

T = 1/f

Question 9

What happens to wavelength as frequency increases?

Answer 9

Decreases

Question 10

bending of sound waves around the obstacles

Answer 10

Sound diffraction

Question 11

Occurs when the sound has a shorter wavelength (=high frequency) than the size of the obstacles

Answer 11

Sound shadow

Question 12

sounds above 1800 Hz (= shorter wavelengths than the human head, 0.6 ft wide / higher frequencies) would be less intense on the other side of the ear

Answer 12

Head shadow effect

Question 13

Sound is bounced off a smooth, flat surface such as 
a brick, metal, or wood. The sound bouncing back off
creates an echo.

Answer 13

Reflection

Question 14

sound which is not reflected
back. The soft furnishings such as a sofa, 
carpet or curtains are absorbing the sound.

Answer 14

Absorption

Question 15

the collection of reflected sounds (echoing sounds) from the surfaces


Answer 15

Reverberation

Question 16

the length of time required for sound to decay 60 dB from its initial level.

Answer 16

Reverberation time

Question 17

A change in the sound of an approaching sound source such as train, plane, or ambulance as it passes you; Pitch sounds higher as it gets closer to you

Answer 17

Doppler effect

Question 18

What happens to the speed of sound as temperature decreases?

Answer 18

Slows down

Question 19

direction of particle motion is parallel to direction of propagation

Answer 19

Longitudinal wave

Question 20

direction of particle motion is perpendicular to direction of propagation

Answer 20

Transverse wave

Question 21

What is an example of a longitudinal wave?

Answer 21

sound waves in air

Question 22

What is an example of a transverse wave?

Answer 22

a ripple on a pond, stadium wave