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Q.

In an experiment on studying the laws of reflection of sound, the tube facing the clock is placed as shown. The position of second tube, at which the ear will get the best reflected sound is obtained when θ  equals

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a

40°

b

30°

c

20°

d

50°

answer is C.

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Detailed Solution

θ=40°

Because angle of incidence equal to angle of reflection.

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