Concise Selina Solutions for Class 8 Physics Chapter 5 Light Energy


Light energy is a form of electromagnetic radiation. Light consists of photons, which are produced when an object's atoms heat up. Light travels in waves and is the only form of energy visible to the human eye.

Light energy, like sound energy, travels out in all directions in waves. Examples: A light bulb, the glowing coils on a toaster, the sun, and even headlights on cars. Electrical Energy - Energy produced by electrons moving through a substance is known as electrical energy.

Light energy, like sound energy, travels out in all directions in waves. Examples: A light bulb, the glowing coils on a toaster, the sun, and even headlights on cars. Electrical Energy - Energy produced by electrons moving through a substance is known as electrical energy. Light carries photons which are tiny packets of energy. When the atoms of an object get heated up, it results in the production of photons. The electrons attain excitement from the heat and results in gaining excess energy. This excess energy is released in the form of photons.

Light energy is the sole form of energy that can be seen with bare eyes. There are lot many commercial and scientific uses of light energy, explained in details in this chapter.