A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case :
sound will be louder but pitch will not be different
sound will be louder and the pitch will also be higher
sound will be louder but pitch will be lower
both loudness and pitch will remain unaffected
By pressing the key gently and then again by, some force, increasing the amplitude of the wave, but the frequency remains the same.
(a) Sound will be louder, but pitch will not be different.
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