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Physics of Sound

Oscillations
Waves
  1. Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, a path difference of 40 cm is equivalent to phase difference of 1.6 π. The frequency of this wave is
    1. 165 Hz
    2. 150 Hz
    3. 660 Hz
    4. 330 Hz
Correct Option: C

From Δx =
λ
Δφ
2π

λ = 2π
Δx
 =
2π(0.4)
 = 0.5 m
Δφ1.6φ

ƒ =
v
 =
330
 = 660 Hz
λ0.5


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