Question

Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room?

Answer 1

1. There are three characteristics of sound, namely loudness, pitch and quality of sound or timbre.
2. Two sounds can be of same loudness or pitch.
3. Quality of sound or timbre helps us to distinguish between two sounds of same loudness or pitch, because quality of two sounds are different.

Hence, quality of sound or timbre helps us to identify our friend by his voice while sitting with others in a dark room.