First slide

Radiation

Question

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

Moderate

A

4
B

16
C

32
D

64

Solution

$\frac{E_{2}}{E_{1}} = \frac{{(2 R)}^{2} {(2 T)}^{4}}{R^{2} T^{4}} = 64$

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