Five Short Questions Answer – Wave and Optics | Physics Class 12 Physics | Short Question [ 2 Marks] Five Important Short Question form Waves and Optics Physics Grade XII | Science

1) Which types of wave propagate in liquid, explain. [HSEB 2063]
=> For the propagation of transverse wave motion medium must have elasticity shape, Liquid does not have elasticity of shape. So transverse wave cannot propagate in liquid, but transverse wave must elasticity of shape of medium is not required. Hence longitudinal wave can pass through the liquid.

2) Longitudinal waves cannot be polarized why ? [ HSEB 2067]
=> Longitudinal waves cannot be polarized because the direction of motion of medium is parallel to the direction of propagation of wave and the vibrations of longitudinal waves cannot be restricted in a particular plane.

3) How are stationary waves formed ? [HSEB 2055]
=> When two waves of the same amplitude and same frequency coming from opposite direction superimpose to each other then the resulting wave is known as stationary wave. There are certain points which are completely stationary are known as nodes. Antinodes are formed between the nodes where particles are vibrated with maximum amplitude. This types of wave can be found in the string of the guitar when plugging.

4) A wave carries energy. Explain
=> A wave in water passing under a boat is momentarily able to lift the boat increasing its gravitational potential energy. the boat also gains a little upward Kinetic energy as the wave pases. If it did not carry energy, the wave could not momentarily increase the boats energy. Thus a wave carries energy.

5) How is the energy transmitted in wave motion ?
=> The particles of the medium vibrate about their mean position in the wave motion. A vibrating particle of the medium hands over its motion to a other near particle. This particle also starts to vibrate about its mean postion and transfers its motion to next particles and so on. In this way, the wave is transferred from particle to particle in the wave motion.

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