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NEET2011PhysicsWaves and SoundActual

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

Options

  1. Aincreases by a factor 20
  2. Bincreases by a factor 10
  3. Cdecreases by a factor 20
  4. Ddecreases by a factor 10

Correct answer

B. increases by a factor 10

Step-by-step solution

Velocity of sound y=n aligned & y₁ y₂ = n₁ ₁ n₂ ₂ (but n₁=n₂ ) & ₂= ₁ y₂ y₁ = ₁ 10 & ₂=10 ₁ aligned

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