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Suresh Sharma
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Asked: 2025-02-10T10:45:49+00:00 In:

Which of the following will remain unchanged when a sound wave enters from air in water?

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0% (a) Amplitude
0% (b) Wavelength
100% (c) Frequency ( 1 voter )
0%(d) Speed
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The correct answer is (c) Frequency. When a sound wave moves from air to water, its speed and wavelength change due to the difference in medium density. However, frequency remains unchanged because it depends only on the source of the sound.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. (c) When a sound wave passes from air to water, the speed of sound, wavelength and amplitude change. But frequency of sound wave does not change. Thus, frequency of a wave is its most inherent property which does not change.

      https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/

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