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(D) According to the laws of reflection,the angle of incidence is equal to the angle of reflection.The incident sound wave makes an angle of $50^o$ wi

Vedclass · Accepted Answer

$40$

Vedclass · Answer

(D) According to the laws of reflection,the angle of incidence is equal to the angle of reflection.The incident sound wave makes an angle of $50^o$ with the reflecting surface (the wall).The normal is perpendicular to the reflecting surface,so the angle between the normal and the surface is $90^o$.Therefore,the angle of incidence $i = 90^o - 50^o = 40^o$.Since the angle of incidence equals the angle of reflection $(i = r)$,the angle of reflection $r$ is also $40^o$.In the figure,$x$ represents the angle of reflection with respect to the normal.Thus,$x = 40^o$.

For hearing the loudest ticking sound of the clock,find the angle $x$ in the figure. (in $^o$)

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