A train is approaching a signal tower at a
speed of 40 m/s. The train engineer sounds the 1000 Hz whistle and
a switchman in the tower responds by sounding the 1200 Hz siren.
The air is still and the speed of sound is 340 m/s. 9) In Situation
16.4, the wavelength of the train whistle tone reaching the
switchman, in SI units, is given by:
A) 0.32
B) 0.34
C) 0.30
D) 0.36
E) 0.38
Homework Answers
considering doppler effect
f = fo v / ( v - vs)
f = 1000* 340 / ( 340 - 40)
f = 1130 Hz
L = c/f = 340 / 1130
L= 0.30
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