A 20 mw 360 nm laser is incident on a metal anode the metal, Physics

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A 20 mw 360 nm laser is incident on a metal anode the metal

Solve the all given parts of given problem:

Problem: A 20 mW 360 nm laser is incident on a metal anode. The metal in the anode has a work function of 1.80 eV.

Part A: What voltage must be applied to completely stop the photo-electrons?

Part B: In the absence of an applied voltage, what current would be measured, Assuming

i) all photons in the laser produce a photo-electron and

ii) all photo-electrons reach the cathode

Part C: Why are these unrealistic assumptions?

Part D: What is the de Broglie wavelength of the emitted electrons?

Please show work I think I have the answer just not positive.

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Physics: A 20 mw 360 nm laser is incident on a metal anode the metal

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Physics: A 20 mw 360 nm laser is incident on a metal anode the metal

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