You want to construct a photocell that works withvisible light. Three materials are readily available:aluminum (Wo= 4.28 eV), lead(Wo = 4.25 eV), and cesium (W0 = 2.14 eV).Part AWhich material(s) would be suitable?aluminumleadcesium

Introduction:The maximum photon energy for visible light is 3.26 eV (Violet) So, only materials with…

Answered: You want to construct a photocell that…

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Quantum Physics

Section: Chapter Questions

Problem 15P

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The 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?
A 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?
Barium has a work function of 2.48 eV. 1. a) What is the maximum kinetic energy of electrons if the metal is illuminated by UV light of wavelength 365 nm? 2. b) What is their speed?
You want to construct a photocell that works with a visible light. Three materials are readily available: aluminum (W0 = 4.28 eV), lead (W0 = 4.25 eV), and cesium (W0 = 2.14 eV). Which material(s) would be suitable?
b) Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. When green light from a mercury lamp (2 = 546.1 nm) is used, a stopping potential of 0.376 V reduces the photocurrent to zero. Based on this measurement, %3D i. Calculate the work function for this metal. ii. If the yellow light from a helium discharge tube (2 = 587.5 nm) is used, find the %3D new stopping potential.
The photoelectric effect in a cosmic context. Ultraviolet radiation striking dust grains composed of the moon’s dominant rock type, feldspar (with work function 4.5 eV), leaves them with a small electric charge. Smaller grains levitate due to the resulting electrostatic repulsion, giving the surface a diffuse dust halo. 200 nm ultraviolet strikes a dust grain and ejects an electron.What is the electron’s kinetic energy?A. 1.7 eV B. 4.5 eVC. 6.2 eV D. 10.7 eV
QUESTION 7 A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h-6.626 x 10-34 J-s-4.141 x 10-15, eV s, 1 eV 1.60 x 10-19 J CA 8.5 x 10¹4 Hz OB. OC 6.8 x 10¹4 Hz 7.6 × 10¹4 Hz 2.7 x 10¹4 Hz
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A hollow metal sphere has an inner radius, R =5 cm, and an outer radius, R, = 6 cm. The metal sphere is initially uncharged and a net charge, +Q, exists in its hollow region, as shown in Figure 1. The sphere is then illuminated from outside by ultraviolet light of wavelength 2 = 220 nm, resulting in the emission of photoelectrons. The work function of the metal is 4.70 eV. R, Vo Va R2 Figure 1 (i) If no photoelectrons emitted by the metal sphere can reach infinity, find the minimum amount of net charge Q that should be located in the hollow region. (ii) If Q = 4x10 C, determine the amount of charge induced on the inner and outer surfaces of the metal sphere, and estimate the number of photoelectrons that can reach infinity.
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You want to construct a photocell that works with visible light. Three materials are readily available: aluminum (Wo= 4.28 eV), lead (Wo = 4.25 eV), and cesium (W0 = 2.14 eV). Part A Which material(s) would be suitable? aluminum lead cesium