Question

A key of 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 pitch will not be different.
• B. sound will be louder and the 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.

Loudness or softness of a sound is determined basically by its amplitude. The amplitude of the sound wave depends upon the force with which an object is made to vibrate. If we strike a table lightly, we hear a soft sound because we produce a sound wave of less energy (amplitude).
Pitch depends upon frequency received by the human ear.