electromagnetic-waves Question 18
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.
(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]
