waves Flashcards
for 1 degree celsius rise in temp, velocity of sound increases by?
0.61 ms-1
how to find beats per second
higher freq - lower frequency
how to find interval bw beats/ time for one beat
1/beats per second
describe the wave motion of beats
waves travel in same direction but different frequencies, causing a series of constructive and deconstructive interference.
til what value of beats could the human ear hear?
can not hear above 10 bps
( will only hear under 10 bps under the condition that the two frequencies are within the range of 20-20k Hz )
effect of wax on number of beats per second
wax decreases the frequency of a tuning fork.
if applied to higher f , bps decreases
but if applied to smaller f, bps increases
formula for nth frequency in stationary waves of a stretched string and both sides open ended tube
nfreq = n velocity/2xlenght
nv/2l
formula for nth frequency in stationary waves for one side open ended tube
(2n-1)f = (2n-1)v / 4L
how to find relative velocity of two bodies in motion
if travelling in same direction –> subtract
opposite direction —> add !
doppler effect formula
f’ = relative v of obsever and sound / relative v of source and sound) x f0
what is red shift
wavelenght increases and freq decreases
red light emitted
star is moving away
in a stationary wave, the velocity of a particle at node is
zero
a phase angle of 180 is similar to the path difference of
nlambda/2
a phase angle of 90 is similar to the path difference of
nlamda/4
a phase angle of 270 is similar to the path difference of
3nlambda/4
