Light energy is known to every person from the moment of birth. Thanks to solar energy, life arose on Earth. The bonfire of primitive man, coal burning in blast furnaces, the fuel of a space rocket - all this is light energy, once stored by plants and animals.

There are various sources of light energy: the sun, stars and the moon, bonfire, chemiluminescent plants, animals. In our time, the Sun remains the main and most important source of energy around the globe.

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Light energy is a type of kinetic energy that has the ability to make the type of light visible to the human eye. Light is defined as a form of electromagnetic radiation emitted by hot objects such as lasers, bulbs, and the sun.

Light consists of photons that are minute packets of energy. When atoms of an object are heated, it produces photons and in this way photons are produced. Electrons get excitation from heat and earn extra energy. Energy is released in the form of a photon and more photons come out as the material heats up.

Light emits as a wave while traveling. However, nothing is necessary to carry the energy along to travel. This is why light can travel in space where there is no air. This is not the case with sound waves because they have to travel through solids, liquids, or gases. Light energy is very fast and travels faster than anything. The speed of light is equal to 186,282 mph.

The Sun emits large amounts of electromagnetic radiation. Man is able to see only a fraction of this energy known as 'visible light'. The way solar energy travels is expressed as waves. Scientists can calculate the amount of energy of a wave by measuring the speed of the wave and the distance between successive points of the wave.

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Visible light constitutes only one of the many types of electromagnetic radiation emitted by the Sun. The electromagnetic spectrum is defined as the range of all possible frequencies of radiation. It reflects various types of electromagnetic radiation from the Sun, including ultraviolet rays and X-rays.

Different types of radiant energy from the Sun have been differentiated within the electromagnetic spectrum and the difference between wavelengths indicates the amount of energy they carry.

Definition of light energy

Light energy is an electromagnetic radiation.

It can be further defined as-

• Light can be defined as a form of energy with particle-like photons that have wavelike properties. It can affect the physiology of an organism. For example, photosynthesis, sense of vision.

• Light energy is a form of energy that is visible to the human eye at specific wavelengths of about 400–700 nanometers.

• This is referred to as the visible light of the electromagnetic spectrum.

• Light is a radiant energy and is an electromagnetic radiation that travels in a straight line and can be seen with the naked eye at specific wavelengths.
  
  
  

  
  
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Uses of Light Energy:

Light energy is a form of electromagnetic radiation that can be seen by the human eye. But there are also many commercial and scientific uses of light energy and some of them are listed below.

Food

Light is the only source of food production for all living organisms. Every organism, except certain chemical substances, is dependent on its energy and light for food. Example - Photosynthesis.

Photosynthesis is the processing of inorganic substances into organic ones using special pigments. Thanks to this phenomenon, plants feed and supply the planet with oxygen. The easiest way to understand what photosynthesis is using this picture:

• Plants use a pigment called chlorophyll to absorb water and carbon dioxide (inorganic substances).

• Plants are affected by the rays of the sun.

• Under the influence of these rays, oxygen and glucose are synthesized from water and carbon dioxide.

• Other living beings breathe oxygen. Emit carbon dioxide - and the circle is closed, everything starts again.

• It was thanks to photosynthesis that the evolution of bacteria into more complex organisms became possible, thus, the solar energy became one of the sources of nutrition for countless organisms.

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The vision

Any organism is able to see objects around them due to the presence of eyes. But they can be useless without lights. The eyes acquire the image when light falls on it and information is sent to the brain. Therefore, light let us see the objects around us.

Colour's

The whole world is beautiful due to colors and all these colors are possible due to light. Light has several spectra and each spectrum has an individual color broadly specified as VIBGYOR.

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