A factory siren has a frequency of 990 Hz.
Calculate the frequency heard by a person
sitting in a car moving at 72 kmh-1 (i) away
from the siren and (ii) towards the siren.
Take the speed of sound in air as 330 ms-1.
1
Expert's answer
2019-05-06T10:11:18-0400
We have
"f_s=990 (Hz); v_o=20 (m\/s); v=330 (m\/s)"
Doppler's effect when source of waves is stationary and observer moving away from source of waves
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