Question

A key of a mechanical piano is first struck gently and then struck again but much harder this time. In the second case -

• A. sound will be louder, but the pitch will be the same.
• B. sound will be louder, and the pitch will also be higher.
• C. sound will be louder, but the pitch will be lowered.
• D. both the loudness and the pitch will remain unaffected.

Answer 1

The correct option is A sound will be louder, but the pitch will be the same.

Loudness depends on the force by which the key is pressed, and pitch depends on the frequency of the particular key.

Since, the key is struck much harder, the loudness should increase and as the same key is struck, the frequency remains the same, so the pitch does not change.

Hence, option $\left(A\right)$ is the correct answer.