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- Light IS energy - and is mass-less, thus without substance.
- Light is a form of energy, there is no substance that give it energy. It is the energy contained in oscillating electromagnetic fields. It isn't purely electric or magnetic. Electric fields have the property of inducing a corresponding perpendicular magnetic field when they change. And changing magnetic fields similarly produce a perpendicular electric field. These changes in the fields propagate outwards in the form of "electromagnetic waves". So it is more sensible to consider magnetism and electricity as two parts of the same coin.
James Clerk Maxwell put all the laws of electricity and magnetism together and came up with Maxwell's equations which describe how electricity and magnetism work. Working through his equations he noticed that they implied that electromagnetic waves (in a vacuum) should travel at a constant speed.
When he plugged in the various electrical and magnetic constants that had been previously carefully measured by experiment he found that within the margin of error of the experiments his calculated speed exactly matched the experimentally measured speed of light. He guessed and said that because of this coincidence that light was an electromagnetic wave.
By assuming that this was correct great inroads were made in physics, including quantum mechanics and relativity.
This and later experiments proved this hypothesis to be true. They started in radio, where a conductor has changing electricity producing an obvious electromagnetic wave, then on to microwave which is the same thing but changing at a faster rate, all the way up to infrared and now visible light and beyond into ultraviolet and xrays.
Wiki User
∙ 11y ago
Wiki User
∙ 13y agoLight of itself does not give off energy. Light is a form of energy. It can be modelled as a wave and consisting of particles, namely photons. These packets of energy can be converted to other forms of energy. As an example, photo cells convert the light into electrical energy. UV Light can also cause sunburn.
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Does lettuce change light energy into chemical energy?
Yes when the sun gives it light( light energy) And you eat it (Chemical Energy)
What is reversible formula for photosynthesis and respiration?
Photosynthesis Needs light energy, co2, and h2o. It gives off Glucose and o2. Respiration needs o2 and glucose. It gives of energy, o2, and h2o.
What kinds of energy is given out by a firework?
A flame releases thermal energy - heat - to the surroundings via conduction to the surrounding air, convection of the air thus heated, and radiation due to the difference in temperature between the flame and the surrounding area. It also releases energy in the form of light.
What is a phospholuminescent substance?
Some compounds of phosphorous will give off light when mechanical energy is applied to them. So any material containing phosphorus that gives off light when bumped around is a phospho-luminescent substance.
What part of a light bulb gives off electricity?
The part of an incandescent light bulb that gets hot and produces the light is called the filament.
What from of energy does lighting gives off?
light and heat energy
What are some examples of chemical energy conv erted into light energy?
Fire The wood is a chemical energy and the fire (gasoline) is a chemical energy the heat from the fire obviously gives off heat and the "crackles" you hear gives off sound energy and the flame gives off light energy
What the sun gives off heat and light?
energy
What part of the Sun gives off light energy?
photosphere
When you light a match it gives off?
heat or exothermic energy
A candle gives off light and heat these are examples of?
Energy
What kind of energy is sun?
The sun gives off heat, light, and radiation energy
Is it a chemical reaction when the moon gives off light energy?
No. The moon does not even give off light energy. It reflects light from the sun. This is a purely physical process.
Does the sun give off solar energy?
Yes the sun does give off solar energy. It also gives off heat and light energy.
Is a light bulb an example og electromagnetic energy?
A light bulb is not an example of electromagnetic energy, but the light which the bulb gives off is an example of electromagnetic energy.
What is an example of electrial energy to light energy to heat energy?
electrical energy gives and provides energy to give energy and to show energy, light energy goes through a system of energy and gives off energy to provides it. heat energy is like sunlight it gives, take , provides, and uses energy.
What energy gives off lights?
Electrical energy can be converted to light. In addition, nuclear energy as in a nuclear weapon will give off a blinding flash of light. Also, using fireflies as an example, chemical reactions can also give off light energy.
