The earth's atmosphere is richer in

Options

A. infra-red radiation
B. ultraviolet radiations
C. visible radiations
D. blue colour radiations

Answer

To solve the question "The Earth's atmosphere is richer in which of the following radiation?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Source of Radiation**:
- The primary source of radiation for Earth is the Sun. The Sun emits various types of electromagnetic radiation, including visible light, ultraviolet (UV) rays, and infrared (IR) rays.

2. **Identify the Types of Radiation**:
- The radiation from the Sun can be categorized into different wavelengths:
- Shorter wavelengths: Ultraviolet (UV) rays, X-rays, and gamma rays.
- Visible light: This is the light that we can see.
- Longer wavelengths: Infrared (IR) rays, microwaves, and radio waves.

3. **Consider the Interaction with the Atmosphere**:
- As sunlight passes through the Earth's atmosphere, shorter wavelengths (like UV rays) tend to scatter due to interactions with atmospheric particles. This scattering effect leads to a reduction in the amount of shorter wavelength radiation that reaches the surface of the Earth.

4. **Determine Which Radiation Reaches the Earth**:
- Since shorter wavelengths are scattered, the longer wavelengths, particularly infrared radiation, are less affected by scattering and can reach the Earth's surface more effectively.

5. **Conclude the Richest Radiation in the Atmosphere**:
- Given that infrared radiation has a longer wavelength and is less likely to scatter, it is concluded that the Earth's atmosphere is richer in infrared radiation.

### Final Answer:
The Earth's atmosphere is richer in **infrared radiation**.