JEE Main 2022 · 26 Jul · Shift 1 · Physics Q54

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PhysicsInteger+4 / -1Question 54 of 90

When a car is approaching the observer, the frequency of horn is 100 Hz. After passing the observer, it is 50 Hz. If the observer moves with the car, the frequency will be $\dfrac x3$ Hz where $x=$ ______.

Your answer

Answer and worked solution

Official answer: 200

Approaching $f\frac v{v-u}=100$ , receding $f\frac v{v+u}=50$ : $f=\frac{200}3$ Hz, heard unchanged when moving with the car.

Answer: 200

Topics:Doppler effect

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JEE Main 2022 · 26 Jul · Shift 1, Physics question 54