Question

For verifying the laws of reflection of sound, a student has to choose from (i) a black polished metal sheet or a white thermocol sheet.
(ii) a 0.5 m long tube of diameter 3 cm or a 1.5 m long tube of diameter 20 cm
He should prefer to choose the (1) metal sheet and the 0.5 m long tube
(2) metal sheet and the 1.5 m long tube
(3) thermocol sheet and the 0.5 m long tube
(4) thermocol sheet and the 1.5 m long tube

Answer 1

Answer:

Answer is 3)

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