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(a) Describe the principle of (i) a ther...

(a) Describe the principle of (i) a thermopile and (ii) a bolometer and show how these devices are used.
(b) Define the term black body. What is meant by black body radiation ? As the temeprature of a black body rises, what changes take place in (i) the total energy radiated from it and (ii) the energy distribution amongst the wavelengths radiated ?

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