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CBSE Class 11-science Answered

Calculate the speed of the fastest electron emitted by a tungsten surface { work function 4.5 eV }when it is irradiated with light of energy 5.8 eV. (given mass of electron 9.1 x 10 kg)
Asked by sonawaneom09 | 07 Feb, 2024, 10:13: AM
answered-by-expert Expert Answer

Einstein's photoelectric equation is written as

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where E = 5.8 eV is incident raditaion on photo-electric surface, W = 4.5 eV is work function of photo-electric material  and

K = [ (1/2) m v2 ]  is maximum kinetic energy of electron , m is mass of electron , v is maximum speed of electron

K = W - E = ( 5.8 - 4.5 ) eV = 1.3 eV

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maximum speed of electron is 6.765 × 105 m/s

Answered by Thiyagarajan K | 07 Feb, 2024, 01:38: PM
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