A black body at 200 K is found to exit maximum energy at a wavelength of `14mu m` . When its temperature is raised to 1000 K , the wavelength at which
A black body at 200 K is found to exit maximum energy at a wavelength of `14mu m` . When its temperature is raised to 1000 K , the wavelength at which maximum energy is emitted is
A. `14mum`
B. `70muF`
C. `2.8mum`
D. `7mum`
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Correct Answer - C
`lamda_(m_(1))T_(1)=lamda_(m_(2))T_(2)`
`therefore lamda_(m_(2))=(lamda_(m_(1))T_(1))/(T_(2))=(14xx200)/(1000)`
`=2.8mum`.
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