Environmental Chemistry - Result Question 32
####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. (a)
Solution:
- 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.
