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Q.

If the temperature of the sun were to be increased from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on the earth to what it was previously will be

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a

4

b

16

c

32

d

64

answer is D.

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Detailed Solution

Q directly proportional to r2T4   ⇒ Q2Q1 = (r2r1)2×(T2T1)4 = (2)2×(2)4 = 64
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