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of the incident radiation is above a certain critical valer, characteristic of that metal. The critical value of frequency is known as the threshold frequency for the metal of the emitting electrode. The emission of photoelectrons starts as soon as light falls on metal surface. It has been found that the time lag between the incidence of photon
and the emission of electron is less than 10-8 s. 3. The maximum kinetic energy with which an electron is emitted from a
metal surface is independent of the intensity of the light and depends
only upon its frequency. 4. The number of photoelectrons emitted i.e. the photoelectric current is
independent of the frequency of the incident light and depends only
upon its intensity. Einstein's Photoelectric Equation To explain photoelectric effect, Einstein postulated that the energy carried by a photon of radiation of frequency v is hv. According to him, the emission of a photoelectron was the result of the interaction of a single photon with an electron, in which the photon is completely absorbes by the electron. We know that to remove an electron from a metal, a certain minimum about of energy w, called word function of the metal, is required. Theus, when a photon of energy hv is absorbed by an electron, an amount of energy at least equal to w (provided hv>w) is used up in liberating the electron free and the difference hv – w becomes available to the electron
as its maximum kinetic energy.” 75. uft unfauteui, je p, 48 100 76. 61, 78 101, 102 V au farfsir À fac 77. qet, u8 103 78. JET, 48 103, 104 79. , u 116, 117 80. het, ye 104, 105 81. तेरापंथ युवक परिषद् जयपुर द्वारा प्रकाशित 'जय शासन जय अनुशासन' में आचार्य तुलसी
का भगवान महावीर के 2500वें निर्वाण महोत्सव के अवसर पर दिए गए एक उद्बोधन के आधार पर 'विकास का आधार-आत्मानुशासन' नामक लेख, पृष्ठ 7
gaat all leis - fatto?, 2004 C
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