Question

Sound waves of wavelength 5m and 6m produces 30 beats in 3sec the velocity of sound is..?

Answer 1

The velocity of sound is 300 m/s.

Explanation:

• By using wave equation

f1 = v / λ

• We are given

λ1 = 5 m

λ2 = 6 m

SO

• Beat Frequency = 30/3 = 10 Hz (1)

But Beat Frequency = | f1 - f2 | (2)

Since fλ = v

Now

f1 = v/5

f2 = v/6

from (1) and (2)

|v/5 - v/6| = 10

v = 300 m/s

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