Name two other devices whiich work on the principles as being utilized in a stethoscope.

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Solution

As we know that Stethoscope used by doctors is based on the phenomenon of reflection of sound waves.
Phenomenon of echoes is also based on reflection of sound waves.
Speaking tubes concentrate the sound to well defined directions by multiple reflection of sound waves.
The working of ear trumpet or hearing aid used by people which are hard of hearing is also based on same principle.

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