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Q.

The velocity of sound waves in air 330 m/sec . For a particular sound in air, a path difference of 40 cm is equivalent to phase difference of 1.6 π . The frequency of this wave is :

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a

165 Hz

b

150 Hz

c

660 Hz

d

330 Hz

answer is C.

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Detailed Solution

Phase difference = 2πλ×path difference

1.6π= 2πλ×40 ⇒λ=50cm = 0.5m

v = nλ 330 = 0.5 × n n = 660Hz

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The velocity of sound waves in air 330 m/sec . For a particular sound in air, a path difference of 40 cm is equivalent to phase difference of 1.6 π . The frequency of this wave is :