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With rate of "7 cal cm"^(-2)s^(-1), radi...

With rate of `"7 cal cm"^(-2)s^(-1)`, radiations are emitted from the black body at `227^(@)C`, the rate of emitted radiations at `727^(@)C` will be . . . . . . .

A

50

B

60

C

80

D

112

Text Solution

Verified by Experts

The correct Answer is:
D
From Stefan - Boltzmann.s law,
`P=AesigmaT^(4)`
`:.P propT^(4)` (Other are constant)
`:.(P_(1))/(P_(2))=((T_(1))/(T_(2)))^(4)`
`:.(7)/(P_(2))=((227+273)/(727+273))^(4)=((500)/(1000))^(4)=(1/2)^(4)=(1)/(16)`
`:.P_(2)=112" cal cm"^(-2)s^(-1)`
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