Question

The engine of a train sounds a whistle at a frequency γ . The frequency heard by a passenger is

a. greater than γ b. less than γ c. equal to 1/γ d. equal to γ​

Answer 1

Answer:

Explanation:

PHYSICS

A train, blowing a whistle of frequency f, is standing in the railway yard. A person is running towards the engine. The frequency of the sound of the whistle as heard by the personn will be

December 27, 2019avatar

Daisy Manohari

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ANSWER

In the given situation , an observer is moving towards a stationary source of sound , therefore by Doppler's effect the apparent frequency f

′

of whistle heard by person (observer) will be ,

f'= f ( v + vo)/ v

where , f= original frequency of sound ,

vo = velocity of observer ,

v= velocity of sound in air ,

It is clear from above formula that , f

′

>f ,the frequency of whistle heard by the person is greater than the original frequency of whistle .