Which of the following make use of multiple reflections?

Stethoscope

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Pendulum

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Curved ceilings of concert halls

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Vibrating tong

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Solution

The correct options are
A
Stethoscope

C
Curved ceilings of concert halls

In a Stethoscope, sound of the heartbeat reaches the doctor's ears by muliple reflection of sound.
Ceilings of concert halls are curved so that sound after multiple reflection, reaches all corners of the hall.
Multiple reflection of sound is not seen in case of pendulum and tong.

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Why are the ceilings of concert halls curved?

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