did any one think that the light is the original energy?And can you explane if there is or not 'a different between light and heat?can I have light without heat?can it be heat without light?
Light is the primary source of energy on earth. However, heat is the primary source of energy at the sun. Light and heat are different energies.. You can have light without heat and vice versa.
I dont think you can call some energy original energy. The universe consists of geometry, particles and fields. Particles contain energy quantities as one of their properties, which allows them to interact (force exertes a force on a particle in an electric field for example) or rather allows the particles interact. You cannot say that fields (or electromagnetic waves or indeed light) are original and particles not, or vice versa. Heat is just randomised kinetic energy within a body (infrared radiation is not really heat, but it has the wavelength to excite molecules and give them KE). Light is varying electromagnetic field of particle(s) (because these particles vibrate). Other two questions are a bit abstract. You can and you can't. There must be vibration to enduce EM waves (light) thus KE and heat. But in the case of microwave background radiation you will not feel it, cos its microwave. In the case of a diode the electrons drop to lower energy states and radiate waves at single frequency vibrating for short time. Can you call it heat? Hard to tell
Light is one form of transformation of energy. The one that emits light is called luminous object. Energy from the object is transmitted into the space in the form of light energy. Similar to light rays we have many other rays such as Gamma rays, X-rays, Microwaves, ultra violet rays infra red rays and radio waves [short, medium and long] waves. All these rays belong to a family called electro-magnetic radiation and energy from an object is transmitted into space All these rays transmit energy at a speed = 3x10^8 m/s, a value which cannot be exceeded by any material objects. The main characteristics of all these radiations are the frequencies of the wave. Their frequency difference gives them different characteristics and properties. Though heat energy is transmitted by conduction and convection, there is another method of transmission of energy called radiant heat. This radiation of heat energy is again electro magnetic radiation. Below 600? C all objects emit heat energy. These radiations are not sensed by our eye, but our skin feels this energy. When we are near a stove we feel hot due to this radiation of energy. When the temperature raises more, high frequency waves are emitted. These frequencies are sensed by our eye and we call these light rays. When the temperature is nearly 1000C we perceive white light (a mixture of all ways sensed by our eye) When the temperature is more than 1000C ultra violet rays are produced which cannot be sensed by our eye. The other rays gamma and X rays cannot be produced only by heating. Thus heat rays and light rays are all belong to one family called electromagnetic radiations.
