Lecture 2: Sound

Question 1

Acoustics

Answer 1

physical properties of sounds in the environment, how they travel through air, etc

Question 2

Psychoacoustics

Answer 2

How we perceive sounds

Question 3

What is sound?

Answer 3

it is a pressure wave moving thru a medium (substance)

Question 4

Where does sound travel through

Answer 4

other mediums like:
water/liquid
metal
bone/skin/tissue
wood

Question 5

Velocity

Answer 5

speed of a sound wave

Question 6

wavelength

Answer 6

distance a sound wave travels in one cycle

Question 7

pure tones

Answer 7

one s8ingle isolated pitch
“simple sound”

Question 8

complex sounds

Answer 8

two or more pitches combined

Question 9

transverse wave

Answer 9

moves perpendicular

Question 10

longitudinal wave

Answer 10

moves in one direction
- these are also sound waves

Question 11

the 4 physical parameters

Answer 11

frequency
amplitude
period
phase

Question 12

frequency

Answer 12

the number of complete cycles

Question 13

amplitude

Answer 13

the between the top and bottom of the wave

Question 14

period

Answer 14

amount of time to complete one cycle

Question 15

phase

Answer 15

the timing of compressions and rarefactions of waves

Question 16

hertz

Answer 16

of cycles per second

Question 17

subsonic

Answer 17

wave that travels slower than the speed of sound

Question 18

supersonic

Answer 18

wave that travels faster than speed of sound

Question 19

infrasonic

Answer 19

below frequencies that humans can hear

Question 20

ultrasonic

Answer 20

above frequencies that humans can hear

Question 21

compression

Answer 21

vibrating object moves in one direction, the air molecules are pushed together causing a increase in density

Question 22

rarefaction

Answer 22

vibrating object moves in the opposite direction, the air molecules are pulled apart causing decrease in density

Question 23

low frequency sounds =

Answer 23

longer period

Question 24

high frequency sounds =

Answer 24

shorter periods

Question 25

humans hear

Answer 25

20 Hz to 20,000 Hz