The maximum wavelength of radiation emitted at 900 K is 4 `mum`, the value of the same at 1200 K will be

Options

A. 1m
B. `1 mu m`
C. `0.3 mum`
D. `3 mum`

Answer

D

Explanation

As, `T_(1)=900 K, lambda_(1)= 4 mum`
and `T_(2) =1200 K`
`:.` From, When's displacement law
`lambda_(1)T_(1)= lambda_(2)T_(2)`
or `lambda_(2)=(lambda_(1)T_(1))/(T_(2))`
`=(4xx900)/(1200)= 3mum`