Which of the following are the effects of the ultraviolet rays of the sun 1 They have ioni...........

General Science (Easy) Physics

Which of the following are the effects of the ultraviolet rays of the sun?

1) They have ionized certain layers of upper atmosphere and this enables reflection of sky waves in radio broadcasting

2) They cause suntan in tropical areas

3) They help in the production of vitamin D in animal bodies

4) They cause periodic disturbances in the earth’s magnetic field

1 and 2

2 and 3

1, 2 and 3

2, 3 and 4

Let's analyze each statement:

- 1) Ultraviolet rays ionize layers of the upper atmosphere (like the ionosphere), enabling reflection of sky waves in radio broadcasting.

- 2) Ultraviolet rays cause suntans and sunburns, especially in tropical areas.

- 3) UV rays help animal bodies produce vitamin D when the skin is exposed to sunlight.

- 4) Periodic disturbances in the earth’s magnetic field are mainly caused by solar wind and magnetic storms, not directly by ultraviolet rays.

Options explained:

- Option 1 (1 and 2): Ignores Vitamin D production, so incomplete.

- Option 2 (2 and 3): Misses the atmospheric layer ionization.

- Option 3 (1, 2 and 3): Covers all correct effects.

- Option 4 (2, 3 and 4): Includes a wrong statement (no. 4).

Correct Answer:

Option 3 (1, 2 and 3)

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