Sound

Question 1

Sound

Answer 1

produced by mechanical disturbance of a material that creates an oscillation of the molecules in the material

Question 2

Sounds propagate faster through

Answer 2

solids, followed by liquids and is slowest through gases

Question 3

within a medium, as density increases, the speed of sound

Answer 3

decreases

Question 4

pitch of a sound

Answer 4

is related to its frequency

Question 5

doppler effect

Answer 5

a shift in the perceived frequency of a sound compared to the actual frequency of the emitted sound when the source of the sound and its detector are moving relative to one another

Question 6

the apparent frequency will be HIGHER than the emitted frequency when …

Answer 6

the source and detector are moving away from each other

Question 7

the apparent frequency will be LOWER than the emitted frequency when …

Answer 7

the source and detector are moving away from each other

Question 8

the apparent frequency can be HIGHER, LOWER, OR EQUAL TO the emitted frequency when …

Answer 8

the two objects are moving in the same direction, depending on their relative speeds

Question 9

when the source is moving at or above the speed of sound,

Answer 9

shock waves (sonic booms) can form

Question 10

loudness or volume of sound (sound level) is related to

Answer 10

its intensity

Question 11

Intensity

Answer 11

the average rate of energy transfer per area across a surface that is perpendicular to the wave
related to waves amplitude
decreases over distance and some energy is lost to attenuation (damping) from frictional forces

Question 12

strings and open pipes (open at both ends) support standing waves, and the length of the string or pipe is equal to

Answer 12

some multiple of half wavelengths

Question 13

Closed pipes (closed at one end)

Answer 13

also support standing waves and the length of the pipe is equal to some odd multiple of quarter - wavelengths

Question 14

Speed of sound is fastest in _______, and slowest in _______

Answer 14

solid with low density; very dense gas

Question 15

pitch frequency is determined by

Answer 15

the length of the air column

Question 16

pitch of human voice sound is controlled by

Answer 16

varying the tension of the vocal cords

Question 17

decrease in frequency = _____ in pitch

Answer 17

decrease

Question 18

In the Doppler Effect, if the source and detector are moving toward each other, the perceived frequency (f’) is ____ than the actual frequency (f).

Answer 18

greater

Question 19

In the Doppler Effect, if the source and detector are moving away from each other, the perceived frequency (f’) is ____ than the actual frequency (f).

Answer 19

Less

Question 20

doubling the amplitude produces a sound wave that has ___ times the intensity

Answer 20

4

Question 21

ultrasound

Answer 21

uses high frequency sound waves outside the range of human hearing to compare the relative densities of tissues in the body

Question 22

doppler ultrasound

Answer 22

used to determine the flow of blood within the body by detecting the frequency shift that is associated with movement toward or away from the receiver

Question 23

In an ultrasound, the transmitter and received do not function simultaneously
(true or false)

Answer 23

true

Question 24

in open pipes, the number o nodes present will tell you

Answer 24

which harmonic it is