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    				| 1. | 
                                    (i) What is thermionic emission ? (ii) Name the unit in which the work function of a metal is expressed. | 
                            
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Answer»  (i) The emission of electrons from a metal surface when heat (or thermal) energy is imparted to it, is called thermionic emission. (ii) eV (electron volt); 1 eV = 1.6 x 10-11 J.  | 
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