Define the following characteristics of sound: (a) (i) Pitch (ii) Loudness (iii) Quality or Timbre (b) A boy receives his echo 3 s later. Find the distance of the reflecting surface from the boy. Speed of sound in air is 342 m s^-1


#1

(i) Pitch: It is that characteristic of sound which helps to distinguish between a shrill and a hoarse sound. Pitch of a sound is the sensation which depends upon frequency.
(ii) Loudness : It is the characteristic of sound which helps to distinguish between a loud sound and a faint sound. A loud sound has a large energy associated with it.
(iii) Quality or Timbre : It is the characteristic of a sound which helps us to trace source i.e., whether it is from Tabla or Guitar. It is this characteristic of sound by which we can recognise a friend only from his voice.
(b) Here, v = 342 m s^-1,
t = 3s,
d = ?
We know that d = Vt/2 = 342 x 3/2 = 513 m