Question

What are the four types of electromagnetic radiations which reaches the earth surface from the Sun?

Answer 1

Electromagnetic radiations:

1. Electromagnetic radiation is energy that travels through empty space or a material medium in the form of electromagnetic waves.
2. The motion of electrically charged particles generates electromagnetic waves.
3. Because these waves emanate from electrically charged particles, they are also known as "electromagnetic radiation."

Types of electromagnetic radiations from the Sun:

Infrared rays:

1. Infrared radiation (IR), sometimes known simply as infrared, is a part of the electromagnetic radiation spectrum with wavelengths ranging from $700$ nanometers (nm) to one millimeter (mm).
2. Infrared waves are longer than visible light waves but shorter than radio waves.

Visible rays:

1. The visible spectrum is the part of the electromagnetic spectrum that can be seen with the naked eye.
2. Electromagnetic radiation in this wavelength range is referred to as visible light or just light.
3. A normal human eye responds to wavelengths ranging from $380$ to$750$ nanometers.

Ultraviolet light:

1. Ultraviolet radiation has a wavelength ranging from $10\mathrm{nm}$ to $400\mathrm{nm}$, which is shorter than visible light but longer than X-rays.
2. UV radiation is found in sunlight and accounts for around $10\%$ of the total electromagnetic energy emitted by the Sun.

Radio waves:

1. Radio waves are the longest wavelengths in the electromagnetic spectrum, often at the frequency of $300$ gigahertz or less.
2. The corresponding wavelength at $300\mathrm{GHz}$ is $1\mathrm{mm}$; at $30\mathrm{Hz}$, the analogous wavelength is $10,000\mathrm{km}$.