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Q: ………. are harmful radiation emitted by the Sun –
  • A. Gamma rays
  • B. UV radiation
  • C. Infrared radiation
  • D. Alpha ray
Correct Answer: Option B - UV rays lie in the wavelength range from around 10⁻⁸ to 10⁻⁷ meters and have a frequency between the ranges 8×10 ¹⁴ to 3×10¹⁶ Hz. UV radiation is harmful as continuous exposure to these will result in skin and eye disease. It also result in the aging of the skin. On the other hand, it is the best source of natural vitamin D, Which is essential for human growth. UV rays have a shorter wavelength range than visible light and therefore cannot be seen by human beings. There are some insects like bumblebees which actually can see ultraviolet rays.
B. UV rays lie in the wavelength range from around 10⁻⁸ to 10⁻⁷ meters and have a frequency between the ranges 8×10 ¹⁴ to 3×10¹⁶ Hz. UV radiation is harmful as continuous exposure to these will result in skin and eye disease. It also result in the aging of the skin. On the other hand, it is the best source of natural vitamin D, Which is essential for human growth. UV rays have a shorter wavelength range than visible light and therefore cannot be seen by human beings. There are some insects like bumblebees which actually can see ultraviolet rays.

Explanations:

UV rays lie in the wavelength range from around 10⁻⁸ to 10⁻⁷ meters and have a frequency between the ranges 8×10 ¹⁴ to 3×10¹⁶ Hz. UV radiation is harmful as continuous exposure to these will result in skin and eye disease. It also result in the aging of the skin. On the other hand, it is the best source of natural vitamin D, Which is essential for human growth. UV rays have a shorter wavelength range than visible light and therefore cannot be seen by human beings. There are some insects like bumblebees which actually can see ultraviolet rays.