Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 34, Problem 3P
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The “work function” of the metal lithium is4.6x10-19 J. If irradiated with light of frequency9.5x1014 Hz, what is:
a) the max.KE of the photoelectrons ejected?
b) their velocity?
When ultraviolet light with a wavelength of 420 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.1 eV. (a) What is the stopping potential for these photoelectrons with this Kmax? (b) What is the threshold frequency for this metal? (c) What is the maximum kinetic energy of photoelectrons when light of wavelength 314 nm falls on the same surface?
The “work function” of the metal lithium is4.6x10-19 J. If irradiated with light of frequency9.5x1014 Hz, what is:
a) the max.KE of the photoelectrons ejected?
Chapter 34 Solutions
Physics for Scientists and Engineers
Ch. 34 - Prob. 1PCh. 34 - Prob. 2PCh. 34 - Prob. 3PCh. 34 - Prob. 4PCh. 34 - Prob. 5PCh. 34 - Prob. 6PCh. 34 - Prob. 7PCh. 34 - Prob. 8PCh. 34 - Prob. 9PCh. 34 - Prob. 10P
Ch. 34 - Prob. 11PCh. 34 - Prob. 12PCh. 34 - Prob. 13PCh. 34 - Prob. 14PCh. 34 - Prob. 15PCh. 34 - Prob. 16PCh. 34 - Prob. 17PCh. 34 - Prob. 18PCh. 34 - Prob. 19PCh. 34 - Prob. 20PCh. 34 - Prob. 21PCh. 34 - Prob. 22PCh. 34 - Prob. 23PCh. 34 - Prob. 24PCh. 34 - Prob. 25PCh. 34 - Prob. 26PCh. 34 - Prob. 27PCh. 34 - Prob. 28PCh. 34 - Prob. 29PCh. 34 - Prob. 30PCh. 34 - Prob. 31PCh. 34 - Prob. 32PCh. 34 - Prob. 33PCh. 34 - Prob. 34PCh. 34 - Prob. 35PCh. 34 - Prob. 36PCh. 34 - Prob. 37PCh. 34 - Prob. 38PCh. 34 - Prob. 39PCh. 34 - Prob. 40PCh. 34 - Prob. 41PCh. 34 - Prob. 42PCh. 34 - Prob. 43PCh. 34 - Prob. 44PCh. 34 - Prob. 45PCh. 34 - Prob. 46PCh. 34 - Prob. 47PCh. 34 - Prob. 48PCh. 34 - Prob. 49PCh. 34 - Prob. 50PCh. 34 - Prob. 51PCh. 34 - Prob. 52PCh. 34 - Prob. 53PCh. 34 - Prob. 54PCh. 34 - Prob. 55PCh. 34 - Prob. 56PCh. 34 - Prob. 57PCh. 34 - Prob. 58PCh. 34 - Prob. 59PCh. 34 - Prob. 60PCh. 34 - Prob. 61PCh. 34 - Prob. 62PCh. 34 - Prob. 63PCh. 34 - Prob. 64PCh. 34 - Prob. 65PCh. 34 - Prob. 66PCh. 34 - Prob. 67PCh. 34 - Prob. 68PCh. 34 - Prob. 69PCh. 34 - Prob. 70PCh. 34 - Prob. 71PCh. 34 - Prob. 72PCh. 34 - Prob. 73P
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- The work function of a photoelectric surface is 2.00 eV. What is the maximum speed of the photoelectrons emitted from this surface when a 450-nm light falls on it?arrow_forwardWhat is the maximum kinetic energy of photoelectrons ejected from sodium by the incident radiation of wavelength 450 nm?arrow_forwardThe work function for potassium is 2.26 eV. What is the cutoff frequency when this metal is used as photoelectrode? What is the stopping potential when for the emitted electrons when this photo electrode is exposed to radiation of frequency 1200 THz?arrow_forward
- What is the wavelength of (a) a 12-keV X-ray photon; (b) a 2.O-MeV y -ray photon?arrow_forwardWhat is the de Brogue wavelength of a proton whose kinetic energy is 2.0 MeV? 10.0 MeV?arrow_forwardShow that the energy E in eV of a photon is given by E=1.241106 m/A. where A is its wavelength in meters.arrow_forward
- At what velocity will an electron have a wavelength of 1.00 m?arrow_forwardFind the maximum velocity of photoelectrons ejected by an 80-nm radiation, if the work function of photoelectrode is 4.73 eV.arrow_forwardIn a photoelectric experiment, a metal with aφ=1.5 eV is used as a target. When a lamp operatingat 500 nm illuminates the target, photoelectrons are observed to be emitted from the target. What isthe maximum kinetic energy of those electrons?arrow_forward
- If light of wavelength, å = 4000 A and intensity 100 W/m* incident on a metal plate of threshold frequency 5.5 x10* Hz , what will be the maximum kinetic energy, and work function of photoelectron? (Take, h=6.6x10* J.s ).arrow_forward(b) A/ The work function of a certain metal is o = 4.15 eV. Determine the minimum frequency of light for which photoelectrons are emitted from the metal. (Planck's constant is: h = 4.1357x10^-15 eV s.) (c) B/ Determine the corresponding wavelength of light. (Possibly useful constant: hc = 1240 eVnm.) Correction: the work function is = 5.30 eV; (a) C/ Calculate the kinetic energy of the emitted electrons if the frequency of the photons is doubled.arrow_forwardThe work function of platinum is 6.35 eV. (a) What is the thresholdfrequency for the photoelectric effect in platinum? (b) Will orange lightof wavelength 590 nm cause ejection of photoelectrons from platinum?What is the energy per photon of this light?arrow_forward
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