Question

A key of 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

Answer 1

The correct option is A

sound will be louder but pitch will not be different

1. Any sound wave pitch depends on the frequency of the wave.
2. When the mechanical piano is struck harder the second time, we find sound will be louder but pitch remains the same because the frequency has not changed.
3. The pitch depends on frequency of the particular key which is being hit and hence there would be no change in pitch of sound.
4. Loudness depends on amplitude which will be more if key is struck harder.

Hence, Correct option is (A).