Q.

In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of copper (ϕ = 4.5e V). The emitter is illuminated by a source of monochromatic light of wavelength 200 nm. The maximum kinetic energy of the photo electrons reaching the collector is ----eV

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answer is 3.70.

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Detailed Solution

KEmax emitted =hcλ−ϕ=1240200−4.5=1.7eV∴KEmax reached =1.7+2=3.7eV
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In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of copper (ϕ = 4.5e V). The emitter is illuminated by a source of monochromatic light of wavelength 200 nm. The maximum kinetic energy of the photo electrons reaching the collector is ----eV