Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses A. If both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion. B. If both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: The setting sun appears to be red. Reason: Scattering of light is directly proportional to the wavelength.A) A
B) B
C) C
D) D
E) E
Correct Answer: C
Solution :
In the evening the setting sun appears red, because sunlight contains all colours but the atmosphere on, around and over the earth contains molecules of water, vapour, dust, air and other impurities. Thus, sunlight which passes through these media get scattered. Atmosphere scatters the red colour, hence sun appears red. From Rayleigh criteria of scattering the amount of Rayleigh scattering then occurs to a beam of light which is dependent on the size of the particles and varies inversely as the fourth power of wavelength.
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