A clean sodium surface is illuminated in vacuum by monochromatic light of wavelength

PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

A clean sodium surface is illuminated in vacuum by monochromatic light of wavelength λ=250 nm\lambda=250\ \text{nm}. The surface is connected to a collector plate through an adjustable potential difference. Constants: c=3.00×108 m s−1c=3.00\times10^8\ \text{m s}^{-1}, h=6.63×10−34 J sh=6.63\times10^{-34}\ \text{J s}, and e=1.60×10−19 Ce=1.60\times10^{-19}\ \text{C}. (a) Calculate the frequency of the incident light. (b) The work function of sodium is 2.28 eV2.28\ \text{eV}. Determine the maximum kinetic energy, in electron-volts, of the emitted photoelectrons. (c) Find the magnitude of the potential difference that must be applied to just stop the photocurrent.

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