Which of the following components of electromagnetic radiation reach the earth as part of solar radiation?

1.Gama- Rays

2.X- Rays

3.Ultraviolet Radiation

4.Visible Rays

5.Infrared Radiation

A1, 2 & 3 only

B3, 4 & 5 only ✓ Correct

C1, 2, 4 & 5 only

D1, 2, 3, 4 & 5

Correct answer: (B) 3, 4 & 5 only

Explanation

The Sun's radiation that actually reaches the ground is dominated by ultraviolet, visible and infrared bands.

Statement 3 on ultraviolet radiation is right, as part of it passes through the ozone shield to the surface.

Statement 4 on visible rays is right, forming the light we see and driving photosynthesis.

Statement 5 on infrared radiation is right, carrying most of the Sun's heat to the earth.

Statement 1 on gamma rays and Statement 2 on X-rays are wrong, since the upper atmosphere absorbs them almost completely.

About half of the incoming solar energy lies in the infrared portion of the spectrum.

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