# If the reflected and hte incident sound waves are at an angle of 120 with each other, the incident angle should be

2
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Now,

As, Angle of incidence =Angle of reflection so,

x°+x°+120°=180°(as a plane surface is involved)

2x°+120°=180°

2x°=180°-120°

2x°=60°

x=60÷2

x=30°.

Therefore the angle of incidence as well the angle of reflection are 30° each...