Multiple choice

What is the requirement for reflection of sound wave?

  1. The size of the reflecting surface must be bigger than the wavelength.

  2. The size of the reflecting surface must be smaller than the wavelength.

  3. The size of the reflecting surface must be equal to the wavelength.

  4. The reflecting surface should be smooth and shiny.
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A Correct answer
Explanation

For sound waves to reflect effectively, the reflecting surface must be larger than the wavelength of the sound wave. If the surface is smaller than the wavelength, the sound will diffract around it rather than reflect. Surface smoothness affects reflection quality but isn't the fundamental requirement.

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