Verified Solution • 2025–26 Session
moderate
QAIPMT-2009-Ph-2158: NEET 2009 Physics - Class 11 AIPMT-2009-Ph-2158 Solution: A black body at \(227^ C\) radiates heat at the rate of \(7\…
A black body at radiates heat at the rate of . At a temperature of , the rate of heat radiated in the same units will be
Multiple Choice Options
- A 50
- B 112
- C 80
- D 60
Step-by-Step Verified Solution
Rate of heat radiated at (227 + 273) K = 7 cals/(cm 2 s)
Let rate of heat radiated at (727 + 273) K = x cals/(cm 2 s)
By Stefan�s law, 7 _ (500) 4 and x _ (1000) 4
_ x 7 = 2 4 _ x = 7 _ 2 4 = 112 cals/(cm 2 s)