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A key of a mechanical piano is struck ge...

A key of a mechanical piano is 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.

Text Solution

Verified by Experts

The correct Answer is:
A
When the key of a piano is struck harder, the metal string below it vibrates with greater amplitude (A). Intensity (loudness) of sound is directly proportional to `A^2`. A piano is a stringed instrument. The pitch in a piano depends on the tension, length and mass of its strings and not on how hard these are struck.
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