Maximum wavelength of radiation from black body at 1640 K temp. is 1.75 mum. If moon is considered as perfect black body and maximum wavelength radiation from it is 14.35 mum, then what should be the temperature of moon ?

Maximum wavelength of radiation from black body at 1640 K temp. is 1.7

1.	Maximum wavelength of radiation from black body at 1640 K temp. is 1.75 mum. If moon is considered as perfect black body and maximum wavelength radiation from it is 14.35 mum, then what should be the temperature of moon ?
Answer» 100K 150 K 200 K 250 K Solution :From Wein.s displacement LAW, `lamda_(m_(1))T_(1)=lamda_(m_(2))T_(2)` `:.T_(2)=T_(1)XX(lamda_(m_(1)))/(lamda_(m_(2))` `=1640xx(1.75)/(14.35)=200K`