Exam 1

Question 1

Elasticity

Answer 1

restoring force

allows something to spring back to beginning state

Question 2

Inertia

Answer 2

tendency to go back to an object’s original state/place in space

Question 3

Hooke’s Law

Answer 3

the restoring force (elasticity) is proportional to the distance of displacement and acts in the opposite direction

Question 4

Damping

Answer 4

decrease in amplitude

can counteract amplitude to a point that there is no sound

Question 5

Frequency

Answer 5

number of cycles per seconds (Hz)

Question 6

Period

Answer 6

the time it takes for one cycle to occur (seconds)

Question 7

Periodic sounds

Answer 7

sounds that have regularly occurring cycles

Question 8

Aperiodic sounds

Answer 8

sounds that do not have regularly occurring cycles

cycles do not take the same amount of time to occur

Question 9

As the wavelength of a wave in a uniform medium increases,

Answer 9

its speed will remain the same

Question 10

As a wavelength of a wave in a uniform medium increases,

Answer 10

its frequency will decrease

Question 11

The speed of a wave depends on

Answer 11

the properties of the medium through which the wave travels

Question 12

Incident wave

Answer 12

starts the wave by a vibration

Question 13

Boundary

Answer 13

surface between 2 different mediums

Question 14

Boundary behaviors

Answer 14

behaviors of a sound going through a boundary

Question 15

Transmission

Answer 15

sound goes through (little or a lot)

Question 16

Absorption

Answer 16

sound loses some energy

Question 17

Diffraction

Answer 17

sound is bending around an obstacle

doesn’t go through the obstacle

Question 18

Refraction

Answer 18

change in speed and direction when sound hits a boundary

Question 19

Reflection

Answer 19

sound comes back toward the incident wave

Question 20

Interference

Answer 20

2 sound waves meeting each other

Question 21

Constructive interference

Answer 21

wavelengths completely line up together (in phase)

Question 22

Destructive interference

Answer 22

area of rarefraction lines up with area of compression (out of phase)
results in no sound

Question 23

Phase

Answer 23

timing of areas of compression and rarefraction

Question 24

Reverberation

Answer 24

the collection of reflected sounds from the surfaces in an enclosure like an auditorium

Question 25

Complex Sinusoid

Answer 25

can hear 2 tones at once

usually compliment each other (periodic)

Question 26

Human perception of frequency

Answer 26

20-20,000 Hz

Question 27

Subsonic sounds

Answer 27

below 20 Hz

Question 28

Supersonic sounds

Answer 28

above 20,000 Hz

Question 29

Shepard tones

Answer 29

sounds that seem like they are continuously going up or down

series of frequencies that cycle through