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Sound Waves (2021)

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Like light waves, sound waves also get reflected when these fall on the surface of an obstacle. But unlike light waves, sound waves do not necessarily require a polished surface for reflection. Also, transverse and longitudinal waves can be set up in strings to measure the speed of a pulse through it.
Questions are based on the paragraph given above. Study the paragraph and answer the questions that follow.
A laboratory had the following apparatus available in it :
I. Two thin wooden hollow tubes
II. An intense and broad source of sound
III. A sharp pointed detector to detect the sound
IV. A well polished metal sheet
A student can do his experiment to verify the laws of reflection of sound successfully by choosing the apparatus labelled as :
(a) I, II, III and IV
(b) I, II and IV
(c) I, III and IV
(d) 1, II and III

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