How does a stethoscope use the principle of reflection of sound?

Question

How does a stethoscope use the principle of reflection of sound? — Exam MCQ

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C. Through multiple reflections within its tube to transmit heartbeat sounds — The correct choice is Through multiple reflections within its tube to transmit heartbeat sounds. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

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A. By absorbing sound waves

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B. By filtering sound by frequency

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D. By directing sound outward

How does a stethoscope use the principle of reflection of sound?

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