(a) Write two points of difference between sound wave and light wave

CBSE Class 9 CBSE Class 9 Science
1

(a) Write two points of difference between sound wave and light wave.
(b) Write an expression relating wave velocity, wavelength and frequency if speed of sound in air is 340 m s^-2.
Calculate:
(i) Wavelength when frequency = 256 Hz.
(ii) Frequency when wavelength = 0.85 m.

2

(a) Two differences are as follows :

(b) Velocity of sound = Frequency x Wavelength