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Chapter Eleven DUAL NATURE OF MATTERnot to be ... - NCERT
ncert.nic.inPhysics 388 (i) Thermionic emissio n: By suitably heating, suf ficient ther mal ener gy can be imparted to the free electrons to enable them to come out of the metal. (ii) Field emissio n: By applying a very strong electric field (of the order of 108 V m–1) to a metal, electrons can be pulled out of the metal, as in a spark plug. (iii)Photo-electric emissio n: When light of suitable ...