A black body at 12270C emits radiation with maximum intensity at a wavelength of 5000 A0. If the temperatures of the body is increased by 10000 c, the maximum intensity will be observed at

The product of wavelength corresponding to maximum intensity of radiation and temperature of the body in Kelvin is constant.According to Wien's law,             λmT = constant (say b)Where λm is a wavelength corresponding to maximum intensity of radiation and T is temperature of the body in Kelvin.         λm'λm= TT'Given, T = 1227 + 273 = 1500 K,           T' = 1227 + 1000 +273 = 2500 K             λm = 5000 A0Hence, λm' = 15002500×5000 = 3000 A0