A key of a mechanical piano is struck gently and then struck harder again. In the second case, a....

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A key of a mechanical piano is struck gently and then struck harder again. In the second case,
a. the sound will be louder but pitch will not be different
b. the sound will be louder and pitch will also be higher
c. both loudness and pitch will remain unaffected
d. sound will be louder but pitch will be lower

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