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. (a)

Solution:

  1. 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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