Q. The unit of Wien’s constant $b$ is
A) ${Wm}^{- 2}K^{- 4}$
B) $m^{- 1}K^{- 1}$
C) ${Wm}^{2}$
D) $MK$
Explanation
According to Wien’s law the product of wavelength corresponding to maximum intensity of radiation and temperature of body (in Kelvin) is constant $ie,\ \lambda_{m}T = b = constant,\$where $b$ is Wien’s constant and has value $2.89 \times 10^{- 3}\ m - K.$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.