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Unreasonable Results (a) What is the binding ene…
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Problem 18 Easy Difficulty

Unreasonable Results
Red light having a wavelength of 700 nm is projected onto magnesium metal to which electrons are bound by 3.68 eV. (a) Use $\mathrm{KE}_{e}=h f-\mathrm{BE}$ to calculate the kinetic energy of
the ejected electrons. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

Answer

a) $\mathrm{BE}=-1.9 \mathrm{eV}$
b) The result in part (a) is unreasonable because Binding energy cannot be negative.
c) The assumption that the photon can knock the electron free is unreasonable.

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Chapter 29

Introduction to Quantum Physics

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Video Transcript

so in this problem, Uh, so with the shit we ship the light into the into the Adam and electron comes out and we know that the weapon itself Devo tone is ah, 700 nanometers. And the money energy of the electron is 3.68 electricals. So we know that the energy of the photo has expression. H Time Seaver. Lambda. All right, so this should be equal to the bunny energy, Plus on the kind of energy. However, if we plug in the video of the Lambda and the being to this expression, you will see that the K has very negative 1.9 electro volts. So that means the kind of energy off the electron is negative. So this is unreasonable. All right. Ah, the kind of energy off the electron should be always positive. And ah, that ihsaa minutes. So the physics here should be Ah, I wish that the Adam with this with this we're blends with the light having this having this wetlands. So basically there was no any electrical comes out. We're no, no electoral would come out. Okay

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