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Waves question

2011 · Q161
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Waves question

2011 · Q161

NEETPhysicsWavesMCQ+4 / −1
Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air
  1. A
    decrease by a factor 10
  2. B
    increase by a factor 20
  3. C
    increase by a factor 10
  4. D
    decrease by a factor 20
View written solutionFree

Correct answer: C

We have, v = nλ\lambda λ

⇒v∝λ\Rightarrow v \propto \lambda⇒v∝λ (as n remains constant)

Thus, as v increases 10 times, λ\lambda λ also increases 10 times.

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