Question

For an enclosure maintained at 1000K, the maximum radiation occurs at wavelength ${\lambda }_m$. If the temperature is raised to 2000K, the peak will shift to :

• A. $0.5{\lambda }_m$
• B. ${\lambda }_m$
• C. $4{\lambda }_m$
• D. $8{\lambda }_m$

Answer 1

Answer: (A)

$0.5{\lambda }_m$

According to Wein's displacement law (${\lambda }_{m}T=constant$), the peak wavelength is inversely proportional to absolute temperature.
Now since temperature is doubled, peak wavelength will become half.