physics sound quiz

Question 1

mechanical wave

Answer 1

disturbance that transfers over a distance

Question 2

Speed of wave depends on..

Answer 2

medium it travels through
-rigid: better at transferring vibrations
-softer: absorb some vibrations

Question 3

types of waves give an example for both

Answer 3

1. Longitudinal
   -direction of wave is parallel to motion
   -sound
2. Transverse
   -direction of wave is perpendicular to motion source
   -light

Question 4

what’s compression and rarefaction

Answer 4

compression: region in longitudinal wave were particles are more close together than normal

rarefaction: longitudinal wave where particles are further apart than normal

Question 5

frequency

Answer 5

number of cycles that occur during a certain time period
-a wave with more energy has higher frequency
-f = N(number of cycles)/t (time) or f=1/T(period)

Question 6

periodic motion

Answer 6

motion repeated in equal intervals of time

Question 7

simple harmonic motion

Answer 7

vibration (oscillation) that is period and its amplitude doesn’t change. So the wave follows the sine function
ex. swing back/forth same height

Question 8

wave speed

Answer 8

how far the wave travels per sencond

Question 9

universal wave length -> for lift

Answer 9

v=^f = speed(m/s) = wavelength(m) x frequency

or C=^f (C is speed of lights 8.00x10^8mls^2)

Question 10

factors that affect wave speed in strings V=root frequency divided by wavelength

Answer 10

1. linear density
   -higher density + decreased wave speed
   -high density requires more force

2.tention
-higher tension= increased wave speed
-loose string absorbs energy taut strings transmits energy

Question 11

Sound

Answer 11

form of energy produced by rapidly vibrating objects heard by the human ear

most young people respond to frequencies of between 20 Hz and 20 000 Hz

Question 12

Range of hearing

Answer 12

infrasonic- lower than 20 Hz
ultrasonic - above 20000 hz

Question 13

tuning fork

Answer 13

-vibrates when struck
-refractions and compressions follow one another as the soundwaves travel through the air from the tunning

Question 14

graphing soundwaves - compression, refraction

Answer 14

compression: high pressure
rarefaction: low pressure

Question 15

what is pitch related to

Answer 15

frequency of sound waves.
-long wavelength, low frequency, low pitch
-short wave length, high pitch, high frequency

Question 16

loundness of sound waves - amp

Answer 16

large amp- loud
small amp - quiet

Question 17

speed of sound depends on..

Answer 17

temperature and the properties of the material
-stiffener the material, the faster the speed of sound

Question 18

sound intensity

Answer 18

amount of energy ebing transferred per unit area

Question 19

decibel

Answer 19

the unit of sound level used to describe sound intensity level.