light energy
light energy


Light is a form of energy and is expressed in joules. The largest source of light is the sun. Sun is the large-scale and most powerful source of light heat and energy.

Definition of light:

Any visible light that is seen by the human eye is also visible and drives photosynthesis. Light has a blue and red wavelength having the chlorophylls ‘A form of energy consisting the practical of photons with wave properties, and in which affects the organism, e.g., through ‘photosynthesis’, etc.

Light Energy:

Light energy is a form of electromagnetic radiation. Light energy consists of photons. Light energy is produced when an object’s atoms heat up. Light energy also produces heat. Light travel in waves and is only one form of energy that Is visible to the human eye.

What is light energy?

Light produces photons which are small packets of energy. As the atoms of an object are heated, it results in the production of photons. The electrons find excitement from the heat and produce extra energy. This energy is emitted in the form of a photon, and more photons are released as the material becomes hotter.

Light energy travels in the form of a wave as it travels. However, no matter is, it is essential to carry light energy to travel. This is why light energy can travel through space where there is no air, whereas it is not the same as sound waves, as they have to travel through solids, liquids, or gas. Light energy is very swift and travels faster than anything else.

The sun produces a large amount of electromagnetic radiation. Humans can only see a small percentage of this energy known as visible light.’ The way solar energy flows are known as waves. Scientists can estimate the wave energy by measuring the wavelength and the distance between consecutive wavelength positions (from crest to crest and trough to trough).

Visible light is only one of the types of electromagnetic radiation produced by the sun. Electromagnetics defines the range of all possible radiation frequencies. It shows various kinds of electromagnetic radiation from the sun, including ultraviolet rays and x-rays.

light energy
light energy

 How does light energy travel?

Light energy travels in the form of waves but it is necessary to carry energy along to travel. This is why light can travel through space because space has no air. Light energy is very quick and faster than other sources of energy. Sun emits a large amount of electromagnetic radiation.

Light energy is a form of energy and is expressed in joules. Light, in physics, is the electromagnetic radiation of any wavelength; nevertheless, the definition of light is sometimes restricted to a specific range of wavelength (about 400-700 nm) that is visible to the human eye.

The latter is particularly referred to as visible light of the electromagnetic spectrum. Visible light is that part of the electromagnetic spectrum that is associated with the sense of sight in animals as well as photosynthesis in plants and other photosynthetic organisms.

As for the sense of sight, sunlight, for instance, is screened out by the atmosphere of the earth while allowing visible light to pass through. It is the visible light that is detected by the human eye. It is also the visible light that drives photosynthesis. Blue and red wavelengths are the two most effectively absorbed wavelengths of visible light.

Source of light energy:

In general, objects which emit their own light are called luminous while objects which do not emit light but can reflect light from other sources are called non-luminous objects. There are many sources for getting light energy of which some of them were obtained from nature while others are produced artificially or may be obtained from other forms of energy. Some sources of light energy are given below.

light energy
light energy


It is a natural source and is considered the oldest source of light energy. Sunlight is an essential source for many natural processes such as the water cycle, photosynthesis, sterilization, sanitation, etc. The energy in the sun is generated because of hydrogen fusion. The light from the sun reaches planets and other bodies which include the earth.

Electric bulbs

They are an important artificial source of light. When an electric current flows through the metallic filament tungsten present inside the bulb, it glows due to resistance. The filament gets heated up and emits light.


On burning fuel, it will produce a flame that emits light. This was used earlier during the night for vision before the invention of the electric bulb. Examples are lanterns.


During the explosion of a powerful bomb, heat is generated along with the emission of light. While testing atomic bombs, the whole area will be illuminated with intense light.

light energy
light energy

Uses of energy in our daily life:

Energy usage is very common in our daily life, every task and anything we perform is by our energy. Humans get energy from food and water but plants get energy in the form of light. Electricity is a different type of energy in our daily life. Today you know electricity is the most used and common use of energy in our daily life.

Types of light energy:

Light energy consists of various types. They are:

Visible light

visible light can be seen by the naked eye. It’s a form of electromagnetic energy. The largest source of visible light energy is the sun. It can also be emitted from light, bulbs, etc.

Infrared light

Infrared light is also a form of electromagnetic energy and it produces heat with light energy. The tv reports use infrared light to communicate with the tv. They travel from the remote to the tv.

X-rays and Ultraviolet light

These are short light waves used by doctors to capture images within our bodies and spot fractures in our bones. Also, dentists use x-rays to monitor the extent of the deterioration of the teeth.

Uses of light energy

Below are the common uses of light energy,

  • Human growth
  • Food Formation
  • Sight and vision
  • Heat and temperature
  • Regulation of physiology
  • Drying and Evaporation
  • Electrical Energy
  • Earth Sanitation
  • Signaling system
  • Sterilization
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Properties of Light Energy


The intensity of light is the rate at which the source releases light energy. Its power unit is a watt. It is also describable as brightness measured at the rate at which light generates in a surface unit or energy per unit time per unit area.


The frequency of light is known as the number of crests that pass through a particular point in a second.


The wavelength of light is known as the distance between two successive crests or troughs.  Light waves travel through the vacuum at the same speed. Wavelength and frequency are slightly similar, thus the higher the frequency, the shorter the wavelength.


It is a mechanism in which unpolarized light transforms into polarized light. Light waves vibrate in more than one plane. Hence, they are considered unpolarized light.


It is a specific point in the time frame of the cyclic waveform. The intensity of light energy increases when the waves are in phase.




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