Question

What is the cause of ''Green house effect'' :-

• A. infra-red rays
• B. ultra violet rays
• C. X-rays
• D. radio waves.

Answer 1

The Correct Option is A

The greenhouse effect is a critical process that affects the earth's climate. It involves the trapping of the sun's warmth in the planet's lower atmosphere. This phenomenon is primarily caused by certain gases, which allow sunlight to enter the atmosphere freely. When the sunlight hits the Earth's surface, it is converted to heat, which is then emitted back towards space as infrared radiation.

Here’s a detailed explanation of how this works:

1. Understanding Infrared Radiation: When sunlight reaches the Earth, it is in the form of visible light and ultraviolet (UV) rays. The Earth absorbs this energy and reradiates it as heat, or infrared radiation, into the atmosphere.
2. The Role of Greenhouse Gases: Certain gases in the atmosphere, like carbon dioxide (CO₂), methane (CH₄), and water vapor, are good at absorbing infrared radiation. When these gases absorb the infrared radiation, they trap the heat in the atmosphere instead of allowing it to escape into space, thus warming the planet.
3. Why Infrared Rays are Responsible: Among the options provided, the accurate cause of the greenhouse effect is the infrared rays. Unlike ultraviolet or X-rays, which have higher energy, infrared radiation is heat energy that is responsible for warming the Earth's surface.
4. Why Other Options are Incorrect:
   • Ultra Violet Rays: These are high-energy rays that primarily affect the skin by causing sunburn and have no significant role in the greenhouse effect.
   • X-rays: These are very high-energy rays used in medical imaging but do not play a part in the natural warming of the Earth's atmosphere.
   • Radio Waves: These are low-energy electromagnetic waves used in communication and also do not contribute to the greenhouse effect.

Thus, the correct answer is: infra-red rays.