Give a reason for each of the following .
(a) The voices of two people talking at the same pitch and loudness sound different.
(b) The strings present in a guitar are of varying thicknesses.
(c) The time period of a simple pendulum of string length 0.5 m remains the same even when its amplitude is halved, doubled or tripled.

Explanation

(a) Since two people produce different qual-ity or timbre of sound, their voices sound different even when they talk at the same pitch and loudness.
(b) The strings of varying thickness produce sound of different pitches as thinner the
wire, higher the pitch and thicker the wire, lower the pitch .
(c) The time period of a simple pendulum depends on the length of the string and not on the amplitude.