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Photoelectric effect and study of photoelectric effect

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By Expert Faculty of Sri Chaitanya
Question

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

Moderate
Solution

KEmax emitted =hcλϕ=12402004.5=1.7eVKEmax reached =1.7+2=3.7eV


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The graph between 1λand stopping potential (V) of three metals having work functions ϕ1,ϕ2 and ϕ3 in an experiment of photo-electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct? Here λ is the wavelength of the incident ray].

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