Question

The unit of Wien’s constant $b$ is

• A. $W{m}^{-2}{K}^{-4}$
• B. $m^{-1}{K}^{-1}$
• C. $W{m}^2$
• 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 $2.89\times 10^{-3}m-K$