A key of a mechanical piano struck gently and then struck again but much
harder this time. In the second case
(a) sound will be louder but pitch will not be different
(b) sound will be louder and pitch will also be higher
(c) sound will be louder but pitch will be lower
(d) both loudness and pitch will remain unaffected
In the second case sound will be louder but the pitch will not change because loudness depends on amplitude. By hitting it hard it will make its amplitude higher.But the frequency will be same. And the point is to be noted is that the loudness depends on the amplitude not the frequency.
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