In the equation above, w is called the work function and it is the minimumenergy required to dislodge an electron from the metal's surface. The value of wvaries from metal to metal, Using Einstein's formula for the energy of a photon,The work function isrelated to the thresholfrequency (and threskwave length) as followe obtain the following expression for the kinetic energy of the ejected electrons:hcw = hv.=(KE),= hv- w = h(v-vThis result helped Einstein explained observations (1) and (2). Since (KE). = mvmust be greater than zero (i.e. m is positive and v is positive), then we know that vmust be greater than ve: Also, a plot of (KE). versus v should be linear and the valueof h is obtained from the slope of the line! The value of h was expected to be (and foundto be) equal to 6.626x10-34 J s!The "appearance" of h in another physical situation suggested that Planck's quantumhypothesis was not that crazy after all.See pfromExample 2-1: A domestic microwave employs radiation of wave length 12.2 cm.What is the energy in, in joules, of one photon of this radiation? What is the energycontent of one mole of these photons?

Given Data: The wavelength is λ=12.2 cm=0.122 m The Planck's constant h=6.62 × 10-34 m2 kg / s and…

Example 2-1: A domestic microwave employs radiation of wave length 12.2 cm. - What is the energy in, in joules, of one photon of this radiation? What is the energy content of one mole of these photons?

Example 2-1: A domestic microwave employs radiation of wave length 12.2 cm. - What is the energy in, in joules, of one photon of this radiation? What is the energy content of one mole of these photons?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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