Question:
In a photoelectric experiment, the collector plate is at $2.0 \mathrm{~V}$ with respect to the emitter plate made of copper $(\varphi=4.5 \mathrm{eV})$. The emitter is illuminated by a source of monochromatic light of wavelength $200 \mathrm{~nm}$. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.
Solution:
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