First slide

Doppler

Question

$\begin{array}{l} A train is moving towards a stationary observer at a constant speed, \\ i s blowing a horn at frequency f_{0} continuously . \\ Which of the following curve best represents the frequency f received by \\ observer as a function of time t ? \end{array}$

Moderate

A
B
C
D

Solution

$\begin{array}{l} While approaching f = (\frac{v}{v - v_{s}}) f_{0} = constant (> f_{0}) \\ while receding f = (\frac{v}{v + v_{s}}) f_{0} = constant (< f_{0}) \end{array}$

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