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
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