An engine is moving on a circular path of radius 100 metre with a speed of 20 metre per second. The frequency observed by an observer standing stationary at the centre of circular path when the engine blows a whistle of frequency 500 Hz is

more than 500 Hz

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less than 500 Hz

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500 Hz

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Solution

The correct option is D 500 Hz
Here relative motion of engine is perpendicular to the observer, so, there is no doppler effect.
So, frequency of whistle reaching the observer will remain same.
So, observed frequency is $500 H z$ .

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An engine is moving on a circular path of radius 100 metre with a speed of 20 metre per second. The frequency observed by an observer standing stationary at the centre of circular path when the engine blows a whistle of frequency 500 Hz is

The correct option is D 500 HzHere relative motion of engine is perpendicular to the observer, so, there is no doppler effect. So, frequency of whistle reaching the observer will remain same.So, observed frequency is 500 Hz.

The correct option is D 500 Hz
Here relative motion of engine is perpendicular to the observer, so, there is no doppler effect.
So, frequency of whistle reaching the observer will remain same.
So, observed frequency is $500 H z$ .