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The quantity which does not change, when sound enters from one medium to another __________

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The quantity which does not change, when sound enters from one medium to another __________

(a) Wavelength

(b) Speed

(c) Frequency

(d) Velocity

This question was posed to me by my college professor while I was bunking the class.

My query is from Progressive Waves topic in chapter Waves of Engineering Physics I

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Best answer
Right choice is (c) Frequency

To explain: Frequency remains unchanged when sound travels from one medium to another.

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