Question: Q. 8. (i) If the earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now ? Explain.
(ii) An EM wave exerts pressure on the surface on which it is incident. Justify. U[Delhi I, II, III 2014]
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Solution:
Ans. (i) Average surface temperature would be lower. Because there would be no green house effect in absence of atmosphere.
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(ii) Since electromagnetic waves carry both energy and momentum, therefore, they exert pressure on the surface on which they are incident.
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[CBSE Marking Scheme 2014]
