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Q.

The spectra of a black body at temperatures 327°C and 627°C are shown in the figure. If A1 andA2 be the areas under the two curves respectively, the value of A2A1 is

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a

8116

b

94

c

278

d

1681

answer is A.

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Detailed Solution

Eλ is Spectral emissive power Eλ∝T4Eλ∝ Area (A)⇒A∝T4A2A1=T2T14=627+273327+2734⇒A2A1=9006004=324=8116
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The spectra of a black body at temperatures 327°C and 627°C are shown in the figure. If A1 andA2 be the areas under the two curves respectively, the value of A2A1 is