Newton’s Law

In a deformed body, restoring force is set up within the body which tends to bring the body back to the normal position. The magnitude…

When an external force is applied to a body, which is not free to move, there will be a relative displacement of the particles. Due…

Consider two isolated hydrogen atoms moving towards each other as shown in Figure. As they approach each other, the following interactions are observed. Fig: electrical…

Matter is a substance, which has certain mass and occupies some volume. Matter exists in three states namely solid, liquid and gas. A fourth state…

The following three theories have been proposed to explain the origin of the Universe. (i) Big Bang theory According to the big bang theory all…

Milky Way looks like a stream of milk across the sky. Some of the important features are given below. (i) Shape and size Milky Way…

A large band of stars, gas and dust particles held together by gravitational forces is called a galaxy. Galaxies are really complex in nature consisting…

Most of the stars appear to be grouped together forming interesting patterns in the sky. The configurations or groups of star formed in the patterns…

The Sun is extremely hot and self-luminous body. It is made of hydrogenous matter. It is the star nearest to the Earth. Its mass is…

A star is a huge, more or less spherical mass of glowing gas emitting large amount of radiant energy. Billions of stars form a galaxy.…