Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Chapter 8, Problem 20SEQ
To determine
The reason behind the decrease in apparent brightness of the combined system of a small blue star and a large red star is greater when the blue star is eclipsed than when the red star is eclipsed.
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ONLY ANSWER 3 AND USE OTHER QUESTIONS FOR CONTEXT
Suppose we have two sources of light, a deep red one with wavelength 700 nm, and a violet one with wavelength 400 nm. Both produce the same optical power, delivering 1 milliwatt (10−310−3 watts) of energy per second per square centimeter to a metal target with an area of 1cm2 located 1 meter from the sources.
1. Which color would deliver more photons each second?
All the photoelectrons that are produced from the light are presumed to be collected by another electrode and we determine the current in amperes using a circuit and an "ammeter", that is, some device that can give a precise quantitative measure of the current. Such a device might use the magnetic field generated by the current, or the voltage produced when the current flows across a resistance.
2. If the work function of the surface is 2 eV, will we see a current with both colors, one color, or neither one? If so, how much (in amperes), or if not, explain.
3. If we now…
For the following homework problems please show all of your work.
1. If the energy of a photon is given by the equation E = hv, where
h is known as Planck's constant, and has the value of h = 4.136 x
10-15 eV -s, then complete the following table. Please note: the unit
called an electron volt (eV) is a unit of energy whose value is compa-
rable to the values seen in atomic transitions, and a Hertz is Hz = 1/s.
Be sure to show all of your work!
%3D
Spectral Region | Frequency (v)
Radio
Energy (E)
3.00 x 10° Hz
Microwave
1.24 x 10- eV
|Infrared
3.00 x 1012 Hz
Red
1.77 eV
Yellow
6.00 x 10" Hz
Blue
3.10 eV
3.00 x 105 Hz
3.00 x 1019 Hz
Ultraviolet
X-Ray
Gamma Ray
1.24 x 10° eV
Solve the following problem and show your complete solutions. Explain your work for better understanding. And illustrate the FBD
Chapter 8 Solutions
Cosmic Perspective Fundamentals
Ch. 8 - Choose the best answer to each of the following....Ch. 8 - Prob. 2QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 4QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 6QQCh. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....
Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Choose the best answer to etch of the following....Ch. 8 - Prob. 13SEQCh. 8 - Prob. 14SEQCh. 8 - Explain all answers clearly, with complete...Ch. 8 - Explain all answers clearly, with complete...Ch. 8 - Prob. 17SEQCh. 8 - Prob. 18SEQCh. 8 - Prob. 19SEQCh. 8 - Prob. 20SEQCh. 8 - Explain all answers clearly, with complete...Ch. 8 - Prob. 22SEQ
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