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Simran Bhatia Grade: 11
        In a photoelectric experiment, the collector plate is at 2.0 V with respect to the emitter plate made of copper (φ = 4.5 eV). The emitter is illuminated by a source of monochromatic light of wavelength 200 nm. Find the minimum and maximum kinetic energy of the photoelectrons reaching the collector.
3 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
										Sol. ∅ = 4.5 eV, λ = 200 nm

Stopping potential or energy = E - ∅ = WC/λ - ∅
Minimum 1.7 V is necessary to stop the electron
The minimum K.E. = 2eV
[Since the electric potential of 2 V is reqd. to accelerate the electron to reach the plates]
the maximum K.E. = (2+1, 7)ev = 3.7 ev.
3 years ago
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