Write the full form of dB.

Name the characteristic of sound which depends on:

(a) amplitude

(b) frequency.

Name the characteristic of sound which can distinguish between the 'notes' (musical sounds) played on a flute and a sitar (both the notes having the same pitch and loudness).

What is the name of very high frequency sounds which cannot be heard by the human ear?

Why do we not hear the screams of a bat ?