physics notes for class 10

1 Au = 1.496 x 10 1 1 m 1 ly = 9.46 x 10 1 5 m 1 parsec = 3.0857 x 10 1 6 m 1 F = 10 - 1 5 m 1 micron or 1 m m = 10 - 6 ..

(i) the magnitude of the smallest unit of charge is 1.6x10 - 1 9 C..

It is defined as the space rate of change of phase. In a distance l , a phase change of 2 p occurs. It must be noted that when a wave passes from one medium to another, its velocity changes. In this process the frequency remains the same, but the wavelength changes in proportion to t..

Consider the positions, where Since the resultant amplitude R is maximum, these points correspond to the antinodes. It may be noted that the antinodes correspond to i.e., zero strain. Thus, antinodes are obtained at those points corresponding t..

Lens Formula - The relationship between distance of the object (u), distance of the image (v) and focal length (f) of the lens is called lens formula or lens equation. This lens formula is applicable to both convex and concave lenses. Note : Points to be remembered while using the lens fo..

Whenever a ray of light passes through a lens (except when it passes through the optical center) it bends. The bending of light rays towards the principal axis is called convergence and bending of light rays away from the principal axis is called divergence. The degree of convergence or divergence..

The frequencies of the harmonics present in an open pipe are proportional to the natural numbers. Owing to the presence of all harmonics, the quality of the note given out by an open pipe is richer and sweeter than that given out by a closed pipe. The fundamental frequency of vibration in..

. BF = PF --------- (4) From equations (3) and (4) we conclude that But by definition PF = f (focal length) and PC = R (radius of curvatur..

The velocity as determined above, gives the velocity of sound at the laboratory temperature t o C. This temperature is noted using a wall thermometer in the laboratory. The experiment is repeated, using tuning forks of different frequencies. The readings are tabulated. The mean value of t..

The life cycle of a star begins with the accretion of hydrogen and helium gas at -173 o C into smaller dense clouds, which contract under their own gravity. This dense cloud of gas contracting under its own gravity is called a Protostar . A cloud of gas from which a star is born is known as Nebula ..