Q139 / 150 · MHT CET 2009 · Physics

The unit of Wien's constant $b$ is

  • A
    $\mathrm{Wm}^{-2} \mathrm{~K}^{-4}$
  • B
    $\mathrm{m}^{-1} \mathrm{~K}^{-1}$
  • C
    $\mathrm{Wm}^{2}$
  • Correct answer
    D
    $\mathrm{m}-\mathrm{K}$

Solution

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

Hence, the correct answer is option: 'D'.

Relevant Questions