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Q.

What should have to verify the laws of reflection of sound if two tubes are used in an experiment?

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a

Equal lengths of about 40 cm to 50 cm.

b

Unequal lengths.

c

Equal lengths but shorter than 40 cm.

d

Of any length.

answer is A.

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Detailed Solution

This is because according to laws of reflection, angle of incidence and angle of reflection should be same. Therefore the ends of the two tubes should not touch the reflecting surface and both the tubes should have same diameter. Hence, to verify the laws of reflection of sound the two tubes have equal lengths of about 40 cm to 50 cm.

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