Which of the following physical quantities remains unchanged when a sound wave enters from one medium to another?

Amplitude

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Loudness

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Frequency

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Wavelength

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Solution

The correct option is C
Frequency

The frequency of a sound wave does not depend on the medium through which it is propagating. For a particular sound wave, it remains invariant in all media. Hence, the frequency of a given sound wave remains unchanged when the sound wave enters from one medium to another.

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