A black body at 200 K is found to emit maximum energy at a wavelength of 14 μm. When its temperature is raised to 1000 K, the wavelength at which maximum energy is emitted is
2.8 μm
λmT = constant
⇒ (λm)2(λm)1 = T1T2 = 2001000 = 15
⇒ (λm)2 = (λm)15 = 14 × μm5 = 2.8μm