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Predict/Calculate Zinc and cadmium have photoelectric work functions given by $W_{2 n}=4.33 \mathrm{eV}$ and $W_{\mathrm{Ca}}=4.22 \mathrm{eV},$ respectively. (a) If both metals are illuminated by UV radiation of thesame wavelength, which one gives off photoelectrons with thegreater maximum kinetic energy? Explain. (b) Calculate themaximum kinetic energy of photoelectrons from each surface if$\lambda=275 \mathrm{nm} .$

b) $0.25 \mathrm{eV}$

Physics 103

Chapter 30

Quantum Physics

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Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

03:21

Predict/Calculate Aluminum…

03:43

The work function for zinc…

03:23

01:54

Consider the metals lithiu…

02:35

Lithium, beryllium, and me…

03:55

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U Ultraviolet light with a…

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work function. Off sync equals work. Function off zinc equals 4.33 electron walls 4.33 electron volts equals are 4.33 Multiply by 1.6, multiplied by 10 to the power minus time. Teen Jules, and this equals 6.9. Multiply by 10 to the power minus 19. Jules Also work function off guard Mia equals four point to electron wolves, and it's equal to 6.86 point. It multiply by 10 to the power minus 19. Jules Smart game. We know they'd edge F equals w less ke h f energy off atone w work function In case the kinetic energy equals edge F minus. W uh, do you can be expressed is Etch See divided by lender minus W. Here. HC, divided by lender, is a constant. It's a constant quantity. If work function is larger, then kinetic energy or ejected electrons is smaller. It's obvious from he's a Christian since getting him his smaller work function, so it gives off for tones with but the maximum kinetic energy. Uh, cadmium has smaller work function, then four. It gives off for two electrons with maximum kinetic energy now let's all part B well sold. Part b r k equals XY divided by lender minus. Ah, work function for think. Therefore, K equals 6.636 point 63 Multiply by 10 to the power minus 34 multiplied by three, multiplied by 10 to the power it divided by 275 Multiplied by 10 to the power minus mine minus 6.9. Multiply by 10 to the power minus 19 under four. K equals 10 to the power minus 19 into 7.2, minus 6.9. And this use this a zero point tree. Little 0.0.3. Multiply by 10 to the power minus 19. Jules, our since 10 to the power minus 19. Jules 10 to the power minus 19. Jules equal 0.6 to 5 Electron walls, Dan four. Uh, kinetic energy equals a zero point one mine electron work, so kinetic energy equals 0.19 electron world substituting ah, 0.6 to 5 Electron world in place off 10 to the power minus 19. Jules wicket. The kinetic energy equals 0.1 mine. Electron volts. Now let's do it for cadmium. Um, for cadmium again using K equals it see divided by Lambda minus warden for cadmium and get equals. K equals 7.2 7.2 multiplied by 10 to the power minus 19 minus, uh, work done for cadmium is a 6.8 6.8 multiplied by 10 to the power minus 19 on their four k equals kinetic energy equals ah, zero point for multiplied by 10 to the power minus 19 Jules and in Electron World's kinetic energy equals zero point to five electron volts, so Connecticut ID T equals 0.25 electron waas.

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