Waves

Question 1

Standing waves

Answer 1

horizontal positions of crests and troughs remaining fixed

Question 2

If a wave is in phase what are the angles?

Answer 2

0 degrees, 360 degrees, or 2Pi

Question 3

What are angles for out of phase?

Answer 3

180 degrees or pi radians

Question 4

What are nodes?

Answer 4

points that don’t vibrate

Question 5

What are antinodes?

Answer 5

point where amplitude is maximized

Question 6

What is the distance between two consecutive nodes?

Answer 6

half wavelength

Question 7

What is sound speed dependent on?

Answer 7

medium’s resistance to compression and its density

Question 8

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

Answer 8

Faster

Question 9

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

Answer 9

Slower

Question 10

What medium does sound travel through the fastest?

Answer 10

solid

Question 11

What medium does sound travel the slowest?

Answer 11

gases

Question 12

What causes the variances of speed of sound?

Answer 12

temperature, pressure, and humidity

Question 13

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

Answer 13

displacement node or no motion

Question 14

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

Answer 14

antinode

Question 15

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

Answer 15

Where there is no pressure

Question 16

Where does motion vary in standing sound wave in pipe?

Answer 16

Where there is constant pressure

Question 17

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

Answer 17

whole number of half wavelengths

Question 18

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

Answer 18

Odd number of quarter wavelengths

Question 19

What are beats?

Answer 19

If two sound waves have slightly different frequencies

Question 20

What is beat frequency equal to?

Answer 20

difference between frequencies of two original sound waves

Question 21

What is intensity?

Answer 21

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

Question 22

Intensity is inversely proportional to what?

Answer 22

the square of the distance to the source

Question 23

What is doppler effect?

Answer 23

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

Question 24

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

Answer 24

higher frequency

Question 25

If object is receding what is perceived sound?

Answer 25

lower frequency

Question 26

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

Answer 26

If detector moves toward or away from stationary source

Question 27

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

Answer 27

Increases

Question 28

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

Answer 28

decreases

Question 29

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

Answer 29

Decrease in frequency