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The unit of Wien 's constant b is...

The unit of Wien 's constant b is

A

`Wm^(-2)K^(-4)`

B

`m^(-1)K^(-1)`

C

`Wm^(2)`

D

`m-K`

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The correct Answer is:
D
According to Wein's law the product of wavelength corresponding to maximum intensity of radiation and temperature of body ( in Kelvin ) in constant ie , `lambda_(m)`T=b=constant were b is Wein's constant and has value ` 2.89 x10^(-3)` m-K.
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