Statement of a problem № 11145


Sunlight, whose visible wavelengths range from 380 to 750 nm, is incident on a sodium surface. The work function for sodium is W0 = 2.28 eV. Concepts: (i) Will electrons with a greater value of KEmax be emitted when the incident photons have a relatively greater or relatively smaller amount of energy? (ii) In the range of visible wavelengths, which wavelength corresponds to incident photons that carry the greatest energy? (iii) What is the smallest value of KEmax with which an electron can be ejected from the sodium? Calculations: Find the maximum kinetic energy KEmax (in joules) of the photoelectrons emitted from the surface and the range of wavelengths that will cause photoelectrons to be emitted.

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