Physics
The condition for reflection of sound wave is :
- surface must be smooth
- surface must be polished
- reflecting surface must be bigger than the wavelength of the sound wave
- reflecting surface must be smaller than the wavelength of the sound wave
Answer
reflecting surface must be bigger than the wavelength of the sound wave
Reason — For sound waves to reflect off a surface, the size of the reflecting surface must be larger than the wavelength of the sound wave because when the size of the reflecting surface is comparable to or smaller than the wavelength of the sound wave, the wave tends to spread out rather than reflecting cleanly.
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