College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Chapter 27, Problem 49AP
To determine
The work function of the metal.
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Far ultraviolet light with a wavelength of 154 nm is incident on an unknown solid surface, which releases photoelectrons with a maximum speed of 8.10 ✕ 105 m/s.
(a) What is the work function of the unknown solid? eV(b) What is the minimum frequency of incident light for which photoelectrons will be released from this surface? Hz
You illuminate a metal with light of wavelength 640 nm and find that the photoelectrons have a maximum kinetic energy of 0.70 eV. You then illuminate the same metal with light of another wavelength and find a maximum kinetic energy of 2.5 eV for the photoelectrons.
What is the second wavelength, in nanometers?
A light source of wavelength λ illuminates a metal and ejects photo electrons with a maximum kinetic energy of 1.2 eV. A second light source with half the wavelength of the first ejects photoelectrons with a maximum kinetic energy of 3.9 eV. What is the work function of the metal? Answer in units of eV.
Chapter 27 Solutions
College Physics
Ch. 27.5 - Prob. 27.1QQCh. 27.5 - Prob. 27.2QQCh. 27.5 - Prob. 27.3QQCh. 27.6 - Prob. 27.4QQCh. 27.6 - Prob. 27.5QQCh. 27 - Prob. 1CQCh. 27 - Prob. 2CQCh. 27 - Prob. 3CQCh. 27 - Prob. 4CQCh. 27 - Prob. 5CQ
Ch. 27 - Prob. 6CQCh. 27 - Prob. 7CQCh. 27 - Prob. 8CQCh. 27 - Prob. 9CQCh. 27 - Prob. 10CQCh. 27 - Prob. 11CQCh. 27 - Prob. 12CQCh. 27 - Prob. 13CQCh. 27 - Prob. 14CQCh. 27 - Prob. 15CQCh. 27 - Prob. 16CQCh. 27 - Prob. 1PCh. 27 - Prob. 2PCh. 27 - Prob. 3PCh. 27 - Prob. 4PCh. 27 - Prob. 5PCh. 27 - Prob. 6PCh. 27 - Prob. 7PCh. 27 - Prob. 8PCh. 27 - Prob. 9PCh. 27 - Prob. 10PCh. 27 - Prob. 11PCh. 27 - Prob. 12PCh. 27 - Prob. 13PCh. 27 - Prob. 14PCh. 27 - Prob. 15PCh. 27 - Prob. 16PCh. 27 - Prob. 17PCh. 27 - Prob. 18PCh. 27 - Prob. 19PCh. 27 - Prob. 20PCh. 27 - Prob. 21PCh. 27 - Prob. 22PCh. 27 - Prob. 23PCh. 27 - Prob. 24PCh. 27 - Prob. 25PCh. 27 - Prob. 26PCh. 27 - Prob. 27PCh. 27 - Prob. 28PCh. 27 - Prob. 29PCh. 27 - Prob. 30PCh. 27 - Prob. 31PCh. 27 - Prob. 32PCh. 27 - Prob. 33PCh. 27 - Prob. 34PCh. 27 - Prob. 35PCh. 27 - Prob. 36PCh. 27 - Prob. 37PCh. 27 - Prob. 38PCh. 27 - Prob. 39PCh. 27 - Prob. 40PCh. 27 - Prob. 41APCh. 27 - Prob. 42APCh. 27 - Prob. 43APCh. 27 - Prob. 44APCh. 27 - Prob. 45APCh. 27 - Prob. 46APCh. 27 - Prob. 47APCh. 27 - Prob. 48APCh. 27 - Prob. 49APCh. 27 - Prob. 50APCh. 27 - Prob. 51APCh. 27 - Prob. 52AP
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- A 600-nm light falls on a photoelectric surface and electrons with the maximum kinetic energy of 0.17 eV are emitted. Determine (a) the work function and (b) the cutoff frequency of the surface. (c) What is the stopping potential when the surface is illuminated with light of wavelength 400 nm?arrow_forwardIf the work function of a metal is 3.2 eV, what is the maximum wavelength that a photon can have to eject a photoelectron from this metal surface?arrow_forwardThe 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_forward
- A 400-nm laser beam is projected onto a calcium electrode. The power of the laser beam is 2.00 mW and the work function of calcium is 2.31 eV. (a) How many photoelectrons per second are ejected? (b) What net power is carried away by photoelectrons?arrow_forwardPhotoelectrons are ejected from a photo electrode and are detected at a distance of 2.50 cm away from the photoelectrical. The work function of the photo electrode is 2.71 eV and the incident radiation has a wavelength of 420 nm. How long does it take a photoelectron to travel to the detector?arrow_forwardA laser with a power output of 2.00 mW at a 400-nm wavelength is used to project a beam of light onto a calcium photoelectrode. (a) How many photoelectrons leave the calcium surface per second? (b) What power is carried away by ejected photoelectrons, given that the work function of calcium is 2.31 eV? (c) Calculate the photocurrent. (d) If the photoelectrode suddenly becomes electrically insulated and the setup of two electrodes in the circuit suddenly starts to act like a 2.00-pF capacitor, how long will current flow before the capacitor voltage stops it?arrow_forward
- Show 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_forwardIn a particular photoelectric effect experiment, photons with an energy of 4.40 eV are incident on a metal surface, producing photoelectrons with a maximum kinetic energy of 2.70 eV. (a) What is the work function of the metal? 5 eV (b) If the photon energy is adjusted to 6.40 eV, what will be the maximum kinetic energy of the photoelectrons? eVarrow_forwardWhen the light of wavelength 250 nm is incident on a metal surface, the maximum speed of the photoelectrons is 4.0 × 105 m/s, what is the work function of the metal in electron-volts?B. Assume that a 100-W light bulb gives off 2.50% of its energy as visible light of wavelength 500 nm. How many photons of visible light are given off in 1.0 min?arrow_forward
- When photons with an energy of 3.0 electron-volts strike a photoelectric surface the maximum kinetic energy of the emitted photoelectrons is 2.0 electron- volts. What is the work function of the ?surface 1.0 ev O 0.67 eV 1.5 ev O 5.0 ev Oarrow_forward20. X-rays generated by an X-ray tube are scattered from crystal planes with a separation of d = 1.26 nm to select a specific wavelength. A scattering angle of theta = 80.0 degree is used to select the 1st order maximum of this wavelength. This X-ray falls on a metal plate with a work function of 6.20 eV and emits electrons. What is the maximum kinetic energy of these photoelectrons?arrow_forwardThe photoelectric effect is the emission of electrons from a metal when light falls on it. The maximum kinetic energy of the electrons is the photon energy less the work function of the metal. A counter-electrode placed near the surface can pick up the photoelectric current. a) The work function of copper is 4.65 eV. Calculate the maximum kinetic energy in eV of the electrons if a copper surface is illuminated with 200 nm UV light. b) If the counter-electrode is charged to +10 V, what will be the maximum kinetic energy of electrons arriving on it? What negative voltage would cut the photocurrent to zero?arrow_forward
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