Waves Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

Standing waves

A

horizontal positions of crests and troughs remaining fixed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

If a wave is in phase what are the angles?

A

0 degrees, 360 degrees, or 2Pi

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are angles for out of phase?

A

180 degrees or pi radians

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are nodes?

A

points that don’t vibrate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are antinodes?

A

point where amplitude is maximized

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the distance between two consecutive nodes?

A

half wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is sound speed dependent on?

A

medium’s resistance to compression and its density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

If resistance to compression is greater what is the effect on speed of sound?

A

Faster

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

If density is than compression of sound what is the effect on speed of sound?

A

Slower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What medium does sound travel through the fastest?

A

solid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What medium does sound travel the slowest?

A

gases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What causes the variances of speed of sound?

A

temperature, pressure, and humidity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What does the close end of a pipe correspond to in a standing sound wave?

A

displacement node or no motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the open end of pipe correspond to in a standing sound wave?

A

antinode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Where does pressure vary most in standing sound wave in a pipe?

A

Where there is no pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Where does motion vary in standing sound wave in pipe?

A

Where there is constant pressure

17
Q

For an open pipe, the distance between displacement nodes is equal to what?

A

whole number of half wavelengths

18
Q

For a closed pipe, the distance between the displacement node and displacement antinode is equal to what?

A

Odd number of quarter wavelengths

19
Q

What are beats?

A

If two sound waves have slightly different frequencies

20
Q

What is beat frequency equal to?

A

difference between frequencies of two original sound waves

21
Q

What is intensity?

A

energy wave transmits per second per unit area. Unit is Watts/meters squared

22
Q

Intensity is inversely proportional to what?

A

the square of the distance to the source

23
Q

What is doppler effect?

A

Difference in frequency that arises whenever a source of waves is moving relative to the detector

24
Q

If an object is approaching, what is the perceived sound?

A

higher frequency

25
Q

If object is receding what is perceived sound?

A

lower frequency

26
Q

according to the doppler effect, what changes the speed of sound?

A

If detector moves toward or away from stationary source

27
Q

If moving toward the stationary source speed of sound increases or decreases?

A

Increases

28
Q

If moving away from the stationary source, the speed of sound decreases or increases?

A

decreases

29
Q

If detector is at rest, an increase in wavelength with constant wave speed will result in what for frequency?

A

Decrease in frequency