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For a black body at temperature 727^@C, ...

For a black body at temperature `727^@C`, its radiating power is 60 watt and temperature of surrounding is `227^@C`. If temperature of black body is changed to `1227^@C` then its radiating power will be-

A

304 W

B

320 W

C

240 W

D

120 W

Text Solution

Verified by Experts

The correct Answer is:
B
`P prop (T^4-T_0^4)`
`P_2/P_1=((1500)^4-(500)^4)/((1000)^4-(500)^4)=(500^4(3^4-1))/(500^4(2^4-1))`
`P_2/60=80/15 rArr P_2 =320 W`
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