Environmental Chemistry - Result Question 10
10. The upper stratosphere consisting of the ozone layer protects us from the sun’s radiation that falls in the wavelength region of
(2019 Main, 12 Jan II)
(a) $600-750 nm$
(b) $400-550 nm$
(c) $0.8-1.5 nm$
(d) $200-315 nm$
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Answer:
Correct Answer: 10. (d)
Solution:
10.
Sun emits UV-radiations, which according to following EM categorisation have the wavelength range from $1 nm$ to $400 nm$.
| Type | Wavelength range |
|---|---|
| Radio wave | $>0.1 m$ |
| Microwave | $0.1 m$ to $1 mm$ |
| Infrared wave | $1 mm$ to $700 nm$ |
| Visible rays | $700 nm$ to $400 nm$ |
| Ultraviolet rays | $400 nm$ to $1 nm$ |
| X-rays | $1 nm$ to $10^{-3} nm$ |
| Gamma rays | $<10^{-3} nm$ |
Thus, option (d) with 200-315 nm range is the correct option.
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