A sound wave strikes a high wall perpendicularly. What is the angle of incidence for the sound wave?

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Solution

The correct option is A
0

Angle of incidence is the angle between normal drawn to the surface and incident wave.
If a wave strikes the surface perpendicularly, the angle of incidence will be equal to zero.
When a sound wave strikes perpendicularly to the surface, it retraces its path.
Thus, option A is correct.

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