what is weins displacement law explain in simple language
 

Dear Student,
Wein's displacement law- It is defined for radiation.The Wien's displacement law describes one of the relations between the emission spectrum of a black body and its temperature. 

λ _max T = b,
where , 
λ _max = maximum wavelength of radiation,
T= temperature of body
b = 2.90 * 10^-3 mK

At high temperature value of maximum wavelength of radiation is low and vice-versa i.e that the higher the temperature, the lower the wavelength λ max for which the radiation curve reaches its maximum.
Regards