________________
583. to 3471 F G ft, Actafilf gran uttell
urar are 7627, 37047TER FE II 16 11 584. ETET, gara cofa qui
भाष्य अनै बलि चूर्णि पिण, पूर्वाचार्य रचित ।। 17 ॥ 585. Fan T T # afa sast, gafar el
feros faut 7 HARI, TES GET H II 18 || 586. Na ten arila 5, FAUT JE BITI
Teef FACTA BRT TOT, ET HIU r II 1911 74. Satish K. Gupta, op. cit., pp. 1085-1088
"Photon A photon is a packet of energy, It possesses energy given by E=hv Where h = 6.62 x 10-34 J s is the Planck's constant and v is the frequency of the photon. If is the wavelength of the photon, then C= v Here, c = 3 x 108 m s-1 is velocity of light. Therefore, E = hv = h c Photoelectric effect Hallwach discovered that an insulated zinc plate connected to a gold leaf electroscope and charged negatively lost its charge, when a beam of ultraviolet light was directed on the plate. In order to explain this observation, Haliwach suggested that the metal surface loses negative charge due to ejection of electrons from its surface by the ultraviolet light. The was termed as photoelectric effect. The phenomenon of ejection of electrons from a metal surface, when light of sufficiently high frequency falls upon it, is known as the photoelectric effect. The electrons so emitted were called photoelectrons. J.J. Thomson showed that the photoelectrons were not sifferent from the ordinary electrons. Laws of photoelectric emission. The various experimental observation led to the various conclusions, which became known as the laws of photoelectric emission, as explained below : 1. The emission of photoelectrons takes place only when the frequency
62
Tot uz 31 125-126
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