The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E <hf – W, where h is Planck's constant, f is the frequency of the light, and W is the work-function.Sodium has W = 3.2×10-19 J. When sodium is illuminated by monochromatic light of a particularfrequency, electrons are emitted with speeds up to 8 x 105 ms-1.a) Calculate the wavelength of the light.b) Calculate the stopping potential.

Given that Work function W = 3.2 X 10-19 J Speed of emitted electrons u = 8 X 105 m/s

The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E < hf – W, where h is Planck's constant, f is the frequency of the light, and W is the work-function. Sodium has W = 3.2x 10-19 J. When sodium is illuminated by monochromatic light of a particular frequency, electrons are emitted with speeds up to 8 x 10° m s-1. а) Calculate the wavelength of the light. b) Calculate the stopping potential.

The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E < hf – W, where h is Planck's constant, f is the frequency of the light, and W is the work-function. Sodium has W = 3.2x 10-19 J. When sodium is illuminated by monochromatic light of a particular frequency, electrons are emitted with speeds up to 8 x 10° m s-1. а) Calculate the wavelength of the light. b) Calculate the stopping potential.

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter27: Quantum Theory

Section27.1: A Particle Model Of Waves

Problem 18SSC

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