1.

A black body emits radiations of maximum intensity at wavelength of 5000Å When the temperature of the body is 1227^(@)C. If the temperature of the body is increased by 1000^(@)C, the maximum intensity of emitted radiation would be observed at. . . . . . .

Answer»

`3000Å`
`4000Å`
`5000Å`
`6000Å`

SOLUTION :According to Wien.s DISPLACEMENT law,
`lamda_(m)T=` constant
`:.lamda_(m_(1))T_(1)=lamda_(m_(2))T_(2)`
`:.lamda_(m_(2))=lamda_(m_(1))XX(T_(1))/(T_(2))`
`lamda_(m_(1))=5000Å`
`T_(1)=1227^(@)C=1500K`
`T_(2)=2227^(@)C=2500K`
`lamda_(m_(2))=?`
`=5000xx(1500)/(2500)`
`:.lamda_(m_(2))=3000Å`


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