Question

8
Q.5 Answer the following questions. (Any four)
1) What is meant by scattering of light? State examples
of scattering of light in day to day life.
2) What is meant by 'elasticity' and 'amplitude"?
3) Which metals are used for making magnet?
(Write the names of the metals)
4) What is umbra and penumbra?
5) Observe the figure and answer the questions.(next page)
....5​

Answer 1

Explanation:

1. Scattering of light is the phenomenon in which light rays get deviated from its straight path on striking an obstacle like dust or gas molecules, water vapours etc. Scattering of light gives rise to many spectacular phenomena such as Tyndall effect and the “red hues of sunrise and sunset”.18-Feb-2016
2. ģFor a longitudinal wave, such as a sound wave, amplitude is measured by the maximum displacement of a particle from its position of equilibrium. When the amplitude of a wave steadily decreases because its energy is being lost, it is said to be damped.
3. The most common metals used for permanent magnets are iron, nickel, cobalt and some alloys of rare earth metals. There are two types of permanent magnets: those from “hard” magnetic materials and those from “soft” magnetic materials. “Hard” magnetic metals tend to stay magnetized over a long period.