Question

An ambulance blowing a siren of frequency 700Hz is traveling slowly towards a vertical reflecting wall with a speed of 2m/s .how many beats are heard per second

Answer 1

Answer:

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Explanation:

Answer 2

Answer:

no. of beats per second is 8.

Explanation:

Given,

the frequency of source (f) = 700 Hz

The velocity of the source (v) = 2 m/s

The velocity of the sound (Vs) = 352 m/s

To find,

The no. of beats per second

We know that when the source is travelling towards the observer then the apparent frequency is given by:

$f' = f(\frac{Vs+v}{Vs -v} )$

$f' = 700(\frac{352 +2}{352 -2} )$

$f' = 700 (\frac{354}{350} )$

f' = 708 Hz

Now the no. of beats is given by f' - f = 708 Hz - 700 Hz = 8 beats per second.

Therefore, no. of beats per second is 8.

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