Sound(12th Grade > Physics ) Questions and answers for exam Preparation

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12th Grade > Physics

SOUND MCQs

Total Questions : 31 | Page 4 of 4 pages

Question 31. 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.

2436 Hz
2400 Hz
2374 Hz
None of these

Discuss Question

Answer: Option A. -> 2436 Hz
:
A

The Horn Of A Car Emits Sound With A Dominant Frequency Of 2...

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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