In communication using radio waves, an antenna at the transmitter radiates of Electromagnetic waves (em waves), which travel through the space and reach the receiving antenna at the other end. As the em wave travels away from the transmitter, the other end. As the em wave travels away f…

"Communication is the act of transmission of information". Every living creature in the world experiences the need to impart or recive information almost continuously with others in the surrounding world. For communication to be successful, it is essential that the sender and th…

The Zorth Low of Thermodynamics led us to the concept of temperature that agree with our commonsense notion. Temperature is a maker of the 'hotness' of a body It determine the direction of flow of heat when two bodies are placed in thermal contact. Heat flow from the body at a hig…

In our daily life we come across various kinds of motions. You have already learnt about some of the e.g. rectilinear motion and motion of a projectile. Both these motions are non- repetitive. We have also about unform circular motion and orbital motion of planets in the solar system. I…

Convection is a mode of heat transfer by actual motion of a matter. It is possible only in fluids. Convection can be natural or forced. In natural convection, gravity plays an important part. When a fuild is heated from below, the hot part expands and, therefore, becames less dense. Bec…