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Another Simple Physic question (1 Viewer)

chazza

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work function of tungsten = 8.6 * 10^-19 J
What is the maximum energy of photo electron ejected from the tungsten surface ?
Given the wavelength = 1.8 * 10^-19 m
Plancks constant constant = 6.63 * 10 ^-34 Js

Show working out please
thanks :D
 

Xayma

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E<sub>1</sub>=hf
=hc/&lambda;

E<sub>photon</sub>=E<sub>1</sub>-W
=6.63*10<sup>-34</sup>*3*10<sup>8</sup>/(1.8*10<sup>-19</sup>)-8.6*10<sup>-19</sup>
=1.105*10<sup>-6</sup> (4 sig figures)

Which is also E<sub>1</sub> the work function in this case provides very little difference.
 
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