ICSE Class 9 Answered
Wien's displacement law
Wien's displacement law shows how the spectrum of black body radiation at any temperature is related to the spectrum at any other temperature. If we know the shape of the spectrum at one temperature, we can calculate the shape at any other temperature.
A consequence of Wien's displacement law is that the wavelength at which the intensity of the radiation produced by a black body is at a maximum, ?max , it is a function only of the temperature
where the constant, b, known as Wien's displacement constant, is equal to 2.8977721(26)×10?3 K m.
Heat can be transfered by three modes conduction , convection and radiation.
For the formation of EM wave go to the theory section it is a complete chapter and could not be discussed in doubts.