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What is the maximum velocity of electrons ejected from a material by 80-nm photons, if they are bound to the material by 4.73 eV?

$1.95 \times 10^{6} \mathrm{m} / \mathrm{s}$

Physics 103

Chapter 29

Introduction to Quantum Physics

Quantum Physics

University of Washington

Simon Fraser University

Hope College

McMaster University

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So in this problem, we have the same motto. Sorry, we have the same model. So we shut the light into the atom and the electron comes out. And then this problem, we know that the bunny energy is full point 4.73 electro volts, and the wavelengths of the phone is off the four times 80 nano meters. And so we know the equation. The energy off, the off the photon is ah h times see over Landa were London is the weaklings. So this a call the kinetic energy plus to find the energy. All right, so we can, according to this equation, we get s o for the kind of energy off the electron. So, Katie, you're going to see that this equal, huh? Turn 0.8 electro volts. And the kind of energy off the electron has expression half, and we spread in the in a low speed limit. So this Sam is the mass of the electron M has It has very 9.1 times 10 to the negative, 31 kilograms. All right. And so that it can So, for this So for their velocity And you turned out to be equal 1.95 times 10 to the six meters a second good

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