Sound

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1. A laboratory had the following apparatus available in it:
(A)Two thin hollow wooden tubes
(B)An intense and broad source of sound
(D)An intense pointed source of sound
(D)A sharp pointed detector to detect the sound
(E) A well polished metal sheet
(F) A white painted thermocol sheet.
A student can do his experiment to verify the laws of reflection of sound successfully by choosing the appartus labelled as