what is the electromagnetic spectrum used for

Fig: 3.8 - Electromagnetic spectrum It is interesting to note that visible light, which the human eye detects, constitutes only a small portion of the total electromagnetic spectrum. The visible spectrum is shown separately. Violet colour has a radi..

Atomic Structure..

Communication Systems..

First step is to gather the materials. You will need a fairly long iron nail or small iron rod, enameled or insulated copper wire, a pair of wire strippers, switch or key, pins and a battery. The insulation at both ends of the copper wire must be removed so that it can be connected to a battery. h..

Faraday and Henry performed lots of experiments to learn about the connection between electricity and magnetism. The results of these experiments have led to the life styles of todays men, who made life easy by using lots of electrical applications. Some of the experiments are as follo..

Sun is the ultimate source of energy for organisms either directly or indirectly solar radiation before entering the atmosphere carries energy at a constant rate of 2 cal cm - 2 min - 1 , which is known as the solar constant. Solar spectrum is made up of short wave radiation, light an..

An electromagnet can be defined as a soft-iron core that is magnetised temporarily by passing a current through a coil of wire wound on the core. Principle: It is based on the magnetic effect of electric curre..

As such substances are subjected to cyclic changes the loss of magnetic properties of substance must be small. Therefore the material should attain high values of intensity of magnetisation I and magnetic field for low values of the external field which is the magnetising field. For this reason sof..

An electric charge moving in a magnetic field experiences a force. This is called electromagnetic force. It is a combination of electricity and magnetism..

Electromagnetic Induction - Michael Faraday the English scientist was the first person to prove that a magnet can create a current To test this he moved a magnet towards and away from the coil of wire connected to a galvanometer He observed that there was a deflection in the galvanometer ..