First slide

Doppler

Question

A detector is released from rest under gravity over a source of sound of frequency $f_{0} = 10^{3} H z$ . The frequency observed by the detector at time t is plotted in the graph. The speed of sound in air is $(g = 10 m / \sec^{2})$ :

Easy

A

330 m/s
B

350 m/s
C

300 m/s
D

310 m/s

Solution

$f = (\frac{V_{s} + V_{0}}{V_{s}}) f_{0} \Rightarrow f = (\frac{V_{s} + gt}{V_{s}}) f_{0} = f_{0} + \frac{{gf}_{0}}{V_{s}} t$

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