Question

The unit of Wien’s constant $ b $ is

• A. $ Wm^{-2}K^{-4} $
• B. $ m^{-1}K^{-1} $
• C. $ Wm^{2} $
• D. $ m - K $

Answer 1

Answer: (D)

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 $2.89 \times 10^{-3} m - K$