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
Answer: (A)
Solution:
The frequency of sound depends on the mechanical structure of the sound-producing device.
Different keys on the piano will produce sounds of various frequencies. A single key will always make the sound of the same frequency. If we strike the key with force, the frequency will not change, but the amplitude of the sound will change, which will lead to a change in loudness.
Frequency is also known as pitch, so we can say if we strike harder, the sound will be louder but the pitch will be the same.
Hence, the correct option is option A