Class 10 Physics

Question 1

(a) Choose the correct statement with respect to Refraction of light

The frequency always changes when light enters from one optical medium to another.
Absorption of light when it strikes the surface of a medium is refraction.
Speed of light changes when it enters from one optical medium to another of different optical density.
Speed of light does not change when it enters from one optical medium to another of different optical density.

1. Does the amplitude remains constant in resonance?

No, amplitude keeps on increasing and becomes maximum.

1. What is Supersonic sound?

Any speed more than the speed of sound is Supersonic.