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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Waves and Sound

Olympiad workbook · NSEP · Waves and Sound

Two factories are sounding their sirens at 400 Hz each. A man walks...

Two factories are sounding their sirens at 400 Hz each. A man walks from one factory towards the other at a speed of

2 \mathrm{~m} / \mathrm{s}

. the speed of sound is

320 \mathrm{~m} / \mathrm{s}

. The number of beats heard per second by the man is

Options

A $6$
B $5$
C $2.5$
D $7.5$

Correct answer

B. $5$

Step-by-step solution

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