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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
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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In the equation above, w is called the work function and it is the minimum energy required to dislodge an electron from the metal's surface. The value of w varies from metal to metal, Using Einstein's formula for the energy of a photon, The work function is related to the threshol frequency (and thresk wave length) as follo we obtain the following expression for the kinetic energy of the ejected electrons: hc w = hv.= (KE), = hv - w = h(v-v This result helped Einstein explained observations (1) and (2). Since (KE). = mv must be greater than zero (i.e. m is positive and v is positive), then we know that v must be greater than ve: Also, a plot of (KE). versus v should be linear and the value of h is obtained from the slope of the line! The value of h was expected to be (and found to be) equal to 6.626x10-34 J s! The "appearance" of h in another physical situation suggested that Planck's quantum hypothesis was not that crazy after all. See p from 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?
Transcribed Image Text:In the equation above, w is called the work function and it is the minimum energy required to dislodge an electron from the metal's surface. The value of w varies from metal to metal, Using Einstein's formula for the energy of a photon, The work function is related to the threshol frequency (and thresk wave length) as follo we obtain the following expression for the kinetic energy of the ejected electrons: hc w = hv.= (KE), = hv - w = h(v-v This result helped Einstein explained observations (1) and (2). Since (KE). = mv must be greater than zero (i.e. m is positive and v is positive), then we know that v must be greater than ve: Also, a plot of (KE). versus v should be linear and the value of h is obtained from the slope of the line! The value of h was expected to be (and found to be) equal to 6.626x10-34 J s! The "appearance" of h in another physical situation suggested that Planck's quantum hypothesis was not that crazy after all. See p from 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?
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