Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Question
Chapter 39, Problem 47CP
(a)
To determine
How the photoelectrons would produce.
(b)
To determine
The work function for the metal.
(c)
To determine
The maximum kinetic energy of the photoelectrons.
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A light source emitting radiation at 7.00 x 10¹4 Hz is incapable of ejecting photoelectrons from a certain
metal. In an attempt to use this source to eject photoelectrons from the metal, the source is given a
velocity toward the metal.
b) When the speed of the light source is equal to 0.280c, photoelectrons just begin to be ejected from the
metal. What is the work function of the metal?
A light source emitting radiation at frequency 7.00 × 1014 Hz is incapable of ejecting photoelectrons from a certain metal. In an attempt to use this source to eject photoelectrons from the metal, the source is given a velocity toward the metal. (a) Explain how this procedure can produce photoelectrons. (b) When the speed of the light source is equal to 0.280c, photoelectrons just begin to be ejected from the metal. What is the work function of the metal? (c) When the speed of the light source is increased to 0.900c, determine the maximum kinetic energy of the photoelectrons.
A light source emitting radiation at 7.00 x 10¹4 Hz is incapable of ejecting photoelectrons from a certain
metal. In an attempt to use this source to eject photoelectrons from the metal, the source is given a
velocity toward the metal.
(a) Explain how this procedure can produce photoelectrons.
Chapter 39 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 39.1 - Prob. 39.1QQCh. 39.2 - Prob. 39.2QQCh. 39.2 - Prob. 39.3QQCh. 39.2 - Prob. 39.4QQCh. 39.3 - Prob. 39.5QQCh. 39.5 - Prob. 39.6QQCh. 39.6 - Prob. 39.7QQCh. 39 - Prob. 1PCh. 39 - Prob. 2PCh. 39 - Prob. 3P
Ch. 39 - Prob. 4PCh. 39 - Prob. 5PCh. 39 - Prob. 6PCh. 39 - Prob. 8PCh. 39 - Prob. 9PCh. 39 - Prob. 10PCh. 39 - Prob. 11PCh. 39 - Prob. 12PCh. 39 - Prob. 13PCh. 39 - Prob. 15PCh. 39 - Prob. 16PCh. 39 - Prob. 17PCh. 39 - Prob. 18PCh. 39 - Prob. 19PCh. 39 - Prob. 20PCh. 39 - Prob. 22PCh. 39 - Prob. 23PCh. 39 - Prob. 24PCh. 39 - Prob. 25PCh. 39 - Prob. 26PCh. 39 - Prob. 27PCh. 39 - Prob. 30PCh. 39 - Prob. 31PCh. 39 - Prob. 32PCh. 39 - Prob. 33PCh. 39 - Prob. 35PCh. 39 - Prob. 37PCh. 39 - Prob. 38PCh. 39 - Prob. 39PCh. 39 - Prob. 40APCh. 39 - Prob. 41APCh. 39 - Prob. 43APCh. 39 - Prob. 44APCh. 39 - Prob. 45APCh. 39 - Prob. 46APCh. 39 - Prob. 47CPCh. 39 - Prob. 48CPCh. 39 - Prob. 49CPCh. 39 - Prob. 50CP
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- Photoelectrons 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_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_forwardA 900-W microwave generator in an oven generates energy quanta of frequency 2560 MHz. (a) How many energy quanta does it emit per second? (b) How many energy quanta must be absorbed by a pasta dish placed in the radiation cavity to increase its temperature by 45.0 K? Assume that the dish has a mass of 0.5 kg and that its specific heat is 0.9 kcal/kg • K. (c) Assume that all energy quanta emitted by the generator are absorbed by the pasta dish. How long must we wait until the dish in (b) is ready?arrow_forward
- Estimate the work function of aluminum, given that the wavelength of 304 nm is the longest wavelength that a photon may have to eject a photoelectron from aluminum photoelectrode.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_forwardTreat the human body as a blackbody and determine the percentage increase in the total power of its radiation when its temperature increases from 98.6 °F to 103 ° F.arrow_forward
- A light source is emitting radiation at 7.63•1014 Hz is incapable of ejecting photoelectrons from a certain metal. However, if the source is given a velocity of 0.28 c towards the metal, photoelectrons just begin to be ejected. A) What is the work function of the metal ? B) Determine the stopping voltage if the source is instead moved at 0.57 c towards the metal ?arrow_forwardYou 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?arrow_forwardAn experimenter finds that no photoelectrons are emitted from tungsten unless the wavelength of light is less than 270 nm. Her experiment will require photoelectrons of maximum kinetic energy 2.0 eV. What frequency of light should be used to illuminate the tungsten?arrow_forward
- 8 5.00-eV photons are incident on a metal, generating photoelectrons that have a maximum kinetic energy of 0.69 eV. Based on the reference table provided at the top of this exam, what is this metal? sodium (Na) O copper (Cu) aluminium (Al) O zinc (Zn) O iron (Fe)arrow_forwardA light source is used in a photoelectric effect experiment to determine the work function of a particular metal. When green light from a mercury lamp (546.1nm) is used, a retarding potential of 0.85V reduces the photocurrent to zero. Based on this measurement, what is the work function for this metal? (Units: eV)arrow_forwardA metal surface is illuminated with light of different wavelengths and the corresponding stopping potentials of the photoelectrons are shown in the Table below. A (A) 5581 61566731 V (V)1,05 0,86 0,67 Using the Table, determine the photoelectric threshold wavelength (in Å).arrow_forward
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