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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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both loudness and pitch will remain unaffected

sound will be louder but pitch will be lower

sound will be louder but pitch will not be different

sound will be louder and pitch will also be higher

answer is A.

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Second time as amplitude increases and sound becomes louder but frequency remains constant. So pitch will be constant.

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