Sound Waves and the Doppler Effect (4D)
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QUESTION
A siren emits
500
Hz
500\ \text{Hz}
500
Hz
; observer moves toward it at
34
m/s
34\ \text{m/s}
34
m/s
. Find
f
′
f'
f
′
with
v
=
340
m/s
v=340\ \text{m/s}
v
=
340
m/s
.
QUESTION
If distance from a point source doubles, what is the change in sound level (approx)?
QUESTION
A
680
Hz
680\ \text{Hz}
680
Hz
source recedes from a stationary observer at
34
m/s
34\ \text{m/s}
34
m/s
. Find
f
′
f'
f
′
with
v
=
340
m/s
v=340\ \text{m/s}
v
=
340
m/s
.
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ANSWER
f
′
≈
618
Hz
f' \approx 618\ \text{Hz}
f
′
≈
618
Hz
. Source recession stretches waves, decreasing frequency by
v
/
(
v
+
v
s
)
≈
0.909
v/(v + v_s) \approx 0.909
v
/
(
v
+
v
s
)
≈
0.909
.
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