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Suresh Sharma
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Asked: 2025-02-10T10:07:26+00:00 In:

A key of a mechanical piano is struck gently and then struck again but much harder this time. In the second case

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100%(a) sound will be louder but pitch will not be different. ( 1 voter )
0% (b) sound will be louder and pitch will also be higher.
0%(c) sound will be louder but pitch will be lower.
0% (d) both loudness and pitch will remain unaffected.
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The correct answer is (a) sound will be louder but pitch will not be different. Loudness depends on the amplitude of vibration, which increases when the key is struck harder. However, pitch depends on frequency, which remains unchanged as it is determined by string properties.
Class 9th Science NCERT MCQ Questions
NCERT Books MCQ Questions Session 2024-2025.

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    1 Answer

    1. (a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced.

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

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