Lecture 2 (1/25)

Question 1

Simple harmonic motion is also called

Answer 1

sinusoidal motion/ sine wave

Question 2

A graph of particle displacement over time is called

Answer 2

time domain waveform or waveform

Question 3

Ap is

Answer 3

peak amplitude
(be able to identify this on a graph)

Question 4

Ap-p is

Answer 4

peak to peak amplitude
(be able to identify this on a graph)

Question 5

Arms is

Answer 5

root mean square amplitude
(the average of all the instantaneous amplitudes)

Question 6

Pressure is created when…

Answer 6

pressure is created when force is applied to a surface area
when the molecules are displaced since they exert a force on adjacent air molecules

Question 7

What is pressure measured in?

Answer 7

dynes/cm^2

Question 8

The least amount of pressure detected by a human ear is

Answer 8

.0002 dynes/cm^2

Question 9

The pain threshold of the ear is

Answer 9

200,000,000 dynes/cm^2

Question 10

What is the dynamic range of hearing?

Answer 10

the range between the softest and the threshold of pain

Question 11

What is power?

Answer 11

the capacity to exert force

Question 12

Intensity is created when…

Answer 12

intensity is created when power is distributed over an area

Question 13

Power is measured in

Answer 13

watts

Question 14

Intensity is measured in

Answer 14

watts/cm2

Question 15

_____ creates intensity, ______ creates pressure

Answer 15

power, force

Question 16

the lowest intensity a human can detect is

Answer 16

1x 10^-16 watts/cm^2

Question 17

threshold of pain of intensity is

Answer 17

1x10^-2 watts/cm^2

Question 18

What is the relationship between intensity and pressure?

Answer 18

intensity= pressure^2

Question 19

What are the 5 ways you can measure amplitude?

Answer 19

1. amplitude peak
2. amplitude peak-peak
3. amplitude rms
4. pressure (dynes/cm^2)
5. power (watts/cm^2)