Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 35Q
To determine
The Kirchhoff’s law which best describes the emission.
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Find the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 × 10-1⁹ J.
(a) a photon having a frequency of 4.20 x 10¹7 Hz
ev
(b) a photon having a wavelength of 4.60 x 10² nm
eV
(a) Calculate the wavelength of light in vacuum that has a frequency of 5.06 x 10
18
nm
(b) What is its wavelength in flint glass?
nm
(c) Calculate the energy of one photon of such light in vacuum. Express the answer in electron volts.
eV
(d) Does the energy of the photon change when it enters the flint glass?
The energy of the photon changes.
The energy of the photon does not change.
Hz.
Explain.
The photoelectric effect can be used in engineering designs for practical applications. For example, infrared goggles used in night-vision applications have materials that give an electrical signal with exposure to the relatively long wavelength of IR light. If the energy needed for signal generation is 7.5 x 10-20 J, what is the minimum wavelength? What is the frequency of light that can be detected? c = 2.998 x 10 m/s h = 6.626 x 10-34 J s m
Chapter 5 Solutions
Universe: Stars And Galaxies
Ch. 5 - Prob. 1QCh. 5 - Prob. 2QCh. 5 - Prob. 3QCh. 5 - Prob. 4QCh. 5 - Prob. 5QCh. 5 - Prob. 6QCh. 5 - Prob. 7QCh. 5 - Prob. 8QCh. 5 - Prob. 9QCh. 5 - Prob. 10Q
Ch. 5 - Prob. 11QCh. 5 - Prob. 12QCh. 5 - Prob. 13QCh. 5 - Prob. 14QCh. 5 - Prob. 15QCh. 5 - Prob. 16QCh. 5 - Prob. 17QCh. 5 - Prob. 18QCh. 5 - Prob. 19QCh. 5 - Prob. 20QCh. 5 - Prob. 21QCh. 5 - Prob. 22QCh. 5 - Prob. 23QCh. 5 - Prob. 24QCh. 5 - Prob. 25QCh. 5 - Prob. 26QCh. 5 - Prob. 27QCh. 5 - Prob. 28QCh. 5 - Prob. 29QCh. 5 - Prob. 30QCh. 5 - Prob. 31QCh. 5 - Prob. 32QCh. 5 - Prob. 33QCh. 5 - Prob. 34QCh. 5 - Prob. 35QCh. 5 - Prob. 36QCh. 5 - Prob. 37QCh. 5 - Prob. 38QCh. 5 - Prob. 39QCh. 5 - Prob. 40QCh. 5 - Prob. 41QCh. 5 - Prob. 42QCh. 5 - Prob. 43QCh. 5 - Prob. 44QCh. 5 - Prob. 45QCh. 5 - Prob. 46QCh. 5 - Prob. 47QCh. 5 - Prob. 48QCh. 5 - Prob. 49QCh. 5 - Prob. 50QCh. 5 - Prob. 51Q
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- The temperature of an object is 310 K. The electromagnetic radiation emitted by this object is: O in the ultraviolet region of the spectrum. O in the microwave region of the spectrum. O in the visible region of the spectrum (red). O in the visible region of the spectrum (yellow). O in the visible region of the spectrum (violet).. O in the infrared region of the spectrum.arrow_forwardFind the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 x 10 19 J. (a) a photon having a frequency of 2.30 x 1017 Hz (b) a photon having a wavelength of 2.50 x 102 nmarrow_forwardThe photoelectric effect can be used in engineering designs for practical applications. For example, infrared goggles used in night-vision applications have materials that give an electrical signal with exposure to the relatively long wavelength of IR light. If the energy needed for signal generation is 6.4 x 10-20 J, what is the minimum wavelength? What is the frequency of light that can be detected? c = 2.998 x 10° m/s h = 6.626 x 10-34 J s s-1 Submit Answer Retry Entire Group No more group attempts remainarrow_forward
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- 1A photon carries 2.56 eV of energy. What is the photon’s frequency? (h = 6.626 x 10-34 J·s; 1 eV = 1.60 x 10-19 J) 6.03 x 1014 Hz 1.70 x 1014 Hz 3.86 x 1014 Hz 2.71 x 1014 Hz 2The frequency of violet light is 7.5 x 1014 Hz. How much energy does a photon of violet light carry? (h = 6.626 x 10-34 J·s; 1 eV = 1.60 x 10-19 J) 0.148 eV 2.73 x 10-2 eV 3.14 x 10-3 eV 3.11 eV 3During a photoelectric effect experiment, light possessing 2.53 eV of energy is incident on the photosensitive material. Electrons are emitted with an energy of 1.71 eV of energy. What is the work function of the material? 4.24 eV 2.53 eV 1.71 eV 0.82 eVarrow_forwardApproximately how many volts would absorbing red photons create in a solar cell?(remember that eV stands for electron-volt] Spectral parts IR-C IR-B IR-A VIS UVA UVB 700 600 500 400 300 200 100 1. 3 Photon energy [eV] 1.7 2.5 3.2 3.8 Spectral irradiance [W/m?eV]arrow_forwardHow much energy does a photon of UV light (frequency = 3.6 x 1016 Hz) have? How fast do the light travel in a vacuum, water (n=1.33), and glass (n=1.50)?arrow_forward
- Roughly what frequency and what kind of light would you need to be able to separate an electron from a proton? O f = 101° H z, x ray f = 1014 H z, visible light O f = 102° H z, y ray %D O f = 10° H z, microwavearrow_forward(a) How many minutes does it take a photon to travel from the Sun to the Earth? in minutes (b) What is the energy in eV of a photon with a wavelength of 533 nm? in eV (c) What is the wavelength (in m) of a photon with an energy of 1.03 eV? in metersarrow_forwardIt takes 492 kJ of energy to remove one mole of electrons from the atoms on the surface of solid gold. What is the speed of the ejected electrons (in m/s), if the incoming light has a wavelength of 200.0 nmarrow_forward
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