Transmission Of Heat Question 261
Question: A black body at 200 K is found to exit maximum energy at a wavelength of $ 14\mu m $ . When its temperature is raised to 1000K, the wavelength at which maximum energy is emitted is
[RPMT 1998; MP PET 1991; BVP 2003]
Options:
A) $ 14\mu m $
B) $ 70\mu F $
C) $ 2.8\mu m $
D) $ 2.8mm $
Show Answer
Answer:
Correct Answer: C
Solution:
$ {\lambda _{m _{1}}}T _{1}={\lambda _{m _{2}}}T _{2}\Rightarrow {\lambda _{m _{2}}}=\frac{{\lambda _{m _{1}}}T _{1}}{T _{2}}=\frac{14\times 200}{1000}=2.8\ \mu m $
BETA
