Question -
Answer -
A body at a particulartemperature produces a continous spectrum of wavelengths. In case of a blackbody, the wavelength corresponding to maximum intensity of radiation is givenaccording to Planck’s law. It can be given by the relation,
Where,
λm =maximum wavelength
T = temperature
Thus, thetemperature for different wavelengths can be obtained as:
For λm = 10−4 cm; 
For λm = 5 ×10−5 cm;
For λm = 10−6 cm; 
and so on.
Thenumbers obtained tell us that temperature ranges are required for obtainingradiations in different parts of an electromagnetic spectrum. As the wavelengthdecreases, the corresponding temperature increases.