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  4. A train is moving with a constant speed along a large circular track. The engine of the train emits a sound of frequency f. The frequency heard by the guard at rear end of the train :

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Q. A train is moving with a constant speed along a large circular track. The engine of the train emits a sound of frequency $f.$ The frequency heard by the guard at rear end of the train :

NTA AbhyasNTA Abhyas 2020

Solution:

Solution
Vreal along line goining $=V_{t}cos\left(90 - \theta \right)-V_{t}cos\left(90 - \theta \right)$
$=$ Zero $\Rightarrow f_{app}=f$