SOUND Flashcards
what type of wave is sound
longitudinal, mechanical
what can sound travel through
any medium except vacuum
what is compression
region of increased pressure on sound wave
what is rarefraction
region of decreased pressure on sound wave
what can sound not travel through
vacuum
what can increase the velocity of sound
temperature
what is the velocity of sounds fastest in travelling through
solids
what is sound intensity
rate of energy through movement through space
how do you calculate sound intensity
I = A2 X F2
what measures sound levels
decibel (dB)
what is the sound intensity equation
IL = 10 log10 (I / Io)
what is the sound intensity equation using logs
IL = 10 log10 I / I0
what happens when two sound waves of different frequency are heard together
alternating constructive and destructive interference
causes the sound to be alternatively soft and loud.
alternating destructive and destructive interference fo alternating frequency soundwaves is termed what
producing beats
how is beat frequency calculated
beat frequency is equal to the absolute value of the difference in frequency of the two waves that produce the beats
if two sound waves with frequencies of 262 Hz and 252 Hz are played simultaneously - what would the beat frequency be
a beat frequency of 10 Hz will be detected
what is the doppler effect
a shift in the frequency of sounds received by the observer due to relative motion of source and observer
what creates change in frequency
relative motion between observer and source
what happens if distance between source and observer is increased
shift to shorter wavelengths and higher frequencies
what happens if distance between source and observer is decreased
shift to longer wavelengths and lower frequencies
