1.    What is meant by reflection of sound? what type of surface best for reflecting sond  ?

The reflection of sound follows the law "angle of incidence equals angle of reflection", sometimes called the law of reflection. The same behavior is observed with light and other waves.

Sound will reflect more from hard substances than soft

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The bouncing back of sound whaen it hits a hard and rough surface is called as bouncing back of sound.Hard and rough surfaces are the best surfaces for sound to reflect.

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