Archive | Physics

Nicol Prism

When an ordinary ray of light is passed through a calcite crystal, it is broken up into two rays:
The ordinary ray which is polarized and has its vibrations perpendicular to the principle section of the crystal and then extra ordinary ray which is polarized and its vibration parallel to the principle section. If by some optical means one of the two rays eliminated the ray emerging through the crystal will be plane polarized. In Nicol Prism ordinary ray is eliminated extra ordinary ray, which is plane polarized, is transmitted through the prism.

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Dispersive Power

The dispersive power of a diffraction grating is defined as the rate of change of the angle of diffraction with the wavelength of light ….

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Polarisation

According to the electromagnetic theory of light, a light wave consists of electric and magnetic vectors vibrating in mutually perpendicular directions both being perpendicular to the direction of propagation of light.
According to the electromagnetic theory of light, a light wave consists of electric and magnetic vectors vibrating in mutually perpendicular directions both being perpendicular to the direction of propagation of light….

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Concept of Mass

Concept of Mass is defined as quantity of matter contained in a body.
The mass of a body is actually the quantity of matter in it, which can never be zero. There are two different kinds of masses of a body.
The values of the two types of masses of a body are same. Inertial mass of a body is the measure of inertia and gravitational mass of a body is a measure of gravitational pull….

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Concept of Time

According to Einstein ‘Time is what a clock reads’.
Any phenomenon that repeats itself regularly can serve as a measure of time. Human heart which beats regularly, rotation of earth around its axis, revolution of earth around the sun are some examples of repetitive phenomena’s, which serve as measures of time.

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Collision

A collision is an isolated event in which two or more colliding bodies exert relatively strong forces on each other for a relatively short time ….

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Binding Energy

The energy required to remove a satellite from its orbit around the earth to infinity is called Binding energy of a satellite.
We know that the satellite revolves around the earth in an orbit near the surface of earth. The satellite gets the necessary centripetal force from the gravitational force of earth. Assume a satellite, revolving around the earth of mass ‘Me’ and radius ‘Re’. It is height ‘h’ above the surface of earth. If ‘v’ is the orbital velocity of the satellite and ‘m’ is the mass….

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Basic Forces in Nature

Basic forces in nature are the forces governing macroscopic as well as microscopic world. These are gravitation forces, weak forces, electromagnetic forces and nuclear forces.
In daily life, we come across many kinds of forces like friction forces, electrostatic forces, magnetic forces, viscous forces etc. These forces are observed to be acting between macroscopic objects. For instance, while walking on rough horizontal surface, the frictional forces….

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Banking of Roads

The phenomenon of raising outer edge of the curved road above the inner edge is to provide necessary centripetal force to the vehicles to take a safer turn and the curved road is called Banking of Roads….

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Apparent Weight

Apparent weight of a today is the weight which does not actually exist. But it appears when the body is kept in a lift or elevator.
We know that earth attracts everybody towards its centre with some force of attraction called Gravity force. Due to this force of gravity, all the bodies experience their weight. If ‘m’ is the mass of a body then its weight is ‘mg’ (vertically downwards) which is equal to the gravity force….

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