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For Potassium Metal, the Work Function (The Minimum

Question 38

Multiple Choice

For potassium metal, the work function (the minimum energy needed to eject an electron from the metal surface) is 3.68 × 10-19 J. Which is the longest wavelength of the following which could excite photoelectrons?


A) 550. nm
B) 500. nm
C) 450. nm
D) 400. nm
E) 350. nm

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