Question

An ambulance blowing a siren of frequency 700 hz is travelling slowly towards a vertical reflecting wall with a speed of 2 ms1. The speed of sound is 350 ms1. How many beats are heard per second

Answer 1

Answer:

I am really sorry because I dont know the answer

Answer 2

8 beats per second.

Explanation:

The complete question is:

How many beats are heard per second by the driver of the ambulance.

Given:

frequency of sound, $f=700\ Hz$

speed of sound source, $v_s=2\ m.s^{-1}$

speed of sound, $S=350\ m.s^{-1}$

Now the wavelength of sound:

$\lambda=\frac{S}{f}$

$\lambda=\frac{350}{700}$

$\lambda=0.5\ m$

No. of wavelength the ambulance passes in one second:

$n'=\frac{v_s}{\lambda}$

$n'=\frac{2}{0.5}$

$n'=4$

∵Since one wavelength has 2 beats therefore the driver listens 8 beats per second.

TOPIC: beats of sound, properties of sound wave

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