Question

A train moving t a speed of 220 ms^-1 towards a stationary object. emits a sound of frequency 1000 Hz. Some of the sound reaching the object gets reflected back to the train as echo. The frequency of the echo as detected by the driver of the train is
(speed of sound in air is 330 ms^-1)

3500 Hz

4000 Hz

5000 Hz

3000 Hz

Solution

5000 Hz

From Doppler's shift, we know for this case
$straight n apostrophe space equals space straight n open parentheses fraction numerator straight v plus straight v subscript straight s over denominator straight v minus straight v subscript straight s end fraction close parentheses space equals space 1000 open parentheses fraction numerator 330 plus 220 over denominator 330 minus 220 end fraction close parentheses equals space 1000 open parentheses 550 over 110 close parentheses space equals space 5000 space Hz$

Some More Questions From Mechanical Properties of Fluids Chapter

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Mechanical Properties Of Fluids

Some More Questions From Mechanical Properties of Fluids Chapter

Is it logical to say that wave motion is a process of propagation of mass?

What is common property of all types of waves?

What are different types of wave motions?

Define transverse wave motion.

Define longitudinal wave motion.

Which of the two waves - elastic waves or electromagnetic waves does need any material media for its propagation?

What is sound?

How sound is produced?

Can sound travel in vacuum?

Can two persons hear each other on the moon? Explain.

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