Asked by precious
a flying bat emits squeaks of frequency 80 kHz.if a stationary observer hears the frequency of the squeaks as 78kHz,is the bat moving towards or away from the observer?determine the speed at which the bat is flying.
Answers
Answered by
Damon
away of course
in general for non-relativistic Doppler effect
f heard = f emmitted (c+vr)/(c+vs)
c = v of wave
vr = v receiver (plus if toward source)
vs = v source, (plus if source moving away from receiver)
use your c of sound
78 = 80 (c+0)/(c+vs)
in general for non-relativistic Doppler effect
f heard = f emmitted (c+vr)/(c+vs)
c = v of wave
vr = v receiver (plus if toward source)
vs = v source, (plus if source moving away from receiver)
use your c of sound
78 = 80 (c+0)/(c+vs)
Answered by
Sharon Taylor Baloyi
given:
fl = 78kHZ
Fs = 80kHz
vl = o (stationary)
vs =?
v =340 m.s-1
fl =v-vl/v+vs•Fs
78 =340-0/340+vs x80
therefore vs=8.72 m.s-1
fl = 78kHZ
Fs = 80kHz
vl = o (stationary)
vs =?
v =340 m.s-1
fl =v-vl/v+vs•Fs
78 =340-0/340+vs x80
therefore vs=8.72 m.s-1
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