Question

The adjacent diagram shows three different modes of vibrations $P,Q$ and $R$ of the same string.
The sound of which string will have maximum shrillness?

Answer 1

Pitch or shrillness is that characteristic of sound by which an acute or shrill can be distinguished from a grave or flat note. Pitch of a sound wave or a vibration depends on its frequency, As frequency increases, the shrillness increases, and as the frequency decreases, the shrillness decreases. In the diagram $P$ is having three vibrations and thus maximum frequency, this its having maximum shrillness. $R$ is having minimum vibrations (one), thus its having minimum shrillness.