Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 10, Problem 4C
To determine
Number of photons emitted each second by a 100 W light bulb?
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Photons released by nuclear decays tend to be in the MeV range, and atomic nuclei are a few femtometers (10-15 m) across. If a single proton trapped in an inescapable rectangular box releases a 1.3 MeV photon when dropping from the n = 2 to the n = 1 state, how wide is the box, in femtometers?
You should find that this quick and dirty estimate is remarkably close to the real size of a nucleus!
The proton mass is about 1.7 x 10-27 kg.
1 MeV = 1.6 x 10-13 J.
Planck's constant is approximately h = 6.6 x 10-34 J s.
1 (a) Show that the entropy per photon in blackbody radiation is independent of the
temperature, and in d spatial dimensions is given by
En-d-1
s = (d + 1)
n=1
E n-d
n=1
(b) Show that the answer would have been d + 1 if the photons obeyed Boltzman
statistics.
You are asked to design a spectral filter that practically removes 99.0% of the low energy photons in an X-ray beam. Such photons
contribute to the patient dose without contributing to the image and are defined as no more than 1% of these photons making it to the
other side of the patient. Assume a patient can be modelled as a 20cm thick homogenous object with linear attenuation coefficients as
shown below in Table 1. What is the thickness of the filter needed to eliminate all the energies which satisfy the above requirement?
Filter linear attenuation properties are given below in Table 2.
Table 1: Linear attenuation coefficients vs. energy of patient equivalent material
Energy [keV]
Habject (mm|
20
0.02601
30
0.02407
40
0.02303
50
60
0.02151
0.02013
Table 2: Linear attenuation coefficients vs. energy of filter material
60
0.06684
20
Energy (keV]
Hrter (mm
30
40
50
70
0.1225
0.1067
0.0872
0.07541
0.06327
Chapter 10 Solutions
Inquiry into Physics
Ch. 10 - Prob. 1SACh. 10 - Prob. 1OACh. 10 - Prob. 1PIPCh. 10 - Prob. 1MIOCh. 10 - Prob. 2MIOCh. 10 - Prob. 1QCh. 10 - Prob. 2QCh. 10 - Prob. 3QCh. 10 - Prob. 4QCh. 10 - Prob. 5Q
Ch. 10 - Prob. 6QCh. 10 - Prob. 7QCh. 10 - Prob. 8QCh. 10 - Prob. 9QCh. 10 - Prob. 10QCh. 10 - Prob. 11QCh. 10 - (Indicates a review question, which means it...Ch. 10 - Prob. 13QCh. 10 - Prob. 14QCh. 10 - (Indicates a review question, which means it...Ch. 10 - Prob. 16QCh. 10 - Prob. 17QCh. 10 - Prob. 18QCh. 10 - Prob. 19QCh. 10 - Prob. 20QCh. 10 - Prob. 21QCh. 10 - Prob. 22QCh. 10 - Prob. 23QCh. 10 - Prob. 24QCh. 10 - Prob. 25QCh. 10 - Prob. 26QCh. 10 - Prob. 27QCh. 10 - Prob. 28QCh. 10 - Prob. 29QCh. 10 - Prob. 30QCh. 10 - Prob. 31QCh. 10 - Prob. 32QCh. 10 - Prob. 33QCh. 10 - Prob. 34QCh. 10 - Prob. 35QCh. 10 - Prob. 36QCh. 10 - Prob. 37QCh. 10 - Prob. 38QCh. 10 - Prob. 39QCh. 10 - Prob. 40QCh. 10 - Prob. 41QCh. 10 - Prob. 42QCh. 10 - Prob. 1PCh. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Prob. 4PCh. 10 - Prob. 5PCh. 10 - Prob. 6PCh. 10 - Prob. 7PCh. 10 - Prob. 8PCh. 10 - Prob. 9PCh. 10 - Prob. 10PCh. 10 - Prob. 11PCh. 10 - Prob. 12PCh. 10 - . Figure 10.47 is the energy-level diagram for a...Ch. 10 - Prob. 14PCh. 10 - Prob. 15PCh. 10 - Prob. 16PCh. 10 - Prob. 17PCh. 10 - Prob. 18PCh. 10 - Prob. 19PCh. 10 - Prob. 20PCh. 10 - Prob. 21PCh. 10 - Prob. 22PCh. 10 - Prob. 23PCh. 10 - Prob. 1CCh. 10 - Prob. 2CCh. 10 - The rate at which solar wind particles enter the...Ch. 10 - Prob. 4CCh. 10 - Prob. 5CCh. 10 - Prob. 6C
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