The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be

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Question -

The horn of a car emits sound with a dominant frequency of 2400 Hz. What will be the apparent dominant frequency heard by a person standing on the road in front of the car if the car is approaching at 18.0 km/h? Speed of sound in air = 340 m/s.

Options:

A . 2436 Hz

B . 2400 Hz

C . 2374 Hz

D . None of these

Answer: Option A
:
A

$f = \frac{v + u_{0}}{v - u_{s}} f_{0}$ [18km/h=5m/s]

app. Frequency= $(\frac{340 + 0}{340 - 5}) \times 2400 = 2436 H z$

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