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

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Solution

Metal surfaces reflect the highest percentage of the incident sound waves, whereas the thermocol sheets absorb the sound waves. Also, a narrow tube allows the selected sound wave to travel more clearly. That's why to verify the laws of reflection, the student should choose a metal sheet with a 0.5 m long tube of 3 cm diameter.

Hence, the correct answer is option 1.

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