Transmission Of Heat Question 205
Question: A black body at a temperature of $ 227^{o}C $ radiates heat energy at the rate of 5 cal/cm2-sec. At a temperature of $ 727^{o}C $ , the rate of heat radiated per unit area in cal/cm2will be
[MP PET 1987; MH CET 2002]
Options:
A) 80
B) 160
C) 250
D) 500
Show Answer
Answer:
Correct Answer: A
Solution:
$ \frac{E _{2}}{E _{1}}={{( \frac{T _{2}}{T _{1}} )}^{4}} $
$ =( \frac{273+727}{237+227} )=\frac{{{(1000)}^{4}}}{{{(500)}^{4}}}=16\Rightarrow E _{2}=80 $
BETA
