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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
`60 =K(1000_(4)-500_(4))`....(i)
`E = K(1500_(4)-500_(4))`....(ii)
from (i) and (ii)
`(E)/(60)=(1500^(4) -500^(4))/(1000^(4)-500^(4))rArr E = 320`.
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