Question

A black body emits maximum radiation near wave length ${\lambda }_m$. the emissivity of the material is 0.7 if the absolute temperature of the black body is doubled, then

• A. the total energy emitted increases eight times
• B. the total energy emitted increases 16 times
• C. the maximum radiation occurs at $2{\lambda }_m$
• D. the maximum radiation occurs at $\left(1/2\right){\lambda }_m$

Answer 1

Answer: (B), (D)

The correct options are
B the total energy emitted increases 16 times
D the maximum radiation occurs at $\left(1/2\right){\lambda }_m$