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Thornton and Rex - Modern Physics 3/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 2 / 5

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
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–/1 –/1 –/1 –/1 –/1
Total
2/5 (40.0%)

Assignment Submission

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Assignment Scoring

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1. –/1 points TR3 2.P.67. My Notes
Question Part
Points
Submissions Used
1 2 3 4 5 6 7 8 9
–/1 –/0 –/0 –/0 –/0 –/0 –/0 –/0 –/0
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
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–/1
 
Calculate the momentum p, kinetic energy K, and total energy E of an electron traveling at each of the speeds tabulated below.
vp (keV/c) K (keV)E (keV)
(a) 0.04c
(b) 0.3c
(c) 0.9c
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2. –/1 points TR3 6.P.33. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/0
0/50 0/50
Total
–/1
 
An atom of mass 3.12 ✕ 10-26 kg oscillates in one dimension at a frequency of 0.90 ✕ 1013 Hz. What is its effective force constant?
N/m

What are its quantized energy levels? (Type your answer using n for n.)
Click here to preview your answer. eV
Click here for help with symbolic formatting.
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3. –/1 points TR3 8.P.09. My Notes
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Points
Submissions Used
1 2 3
–/1 –/0 –/0
0/50 0/50 0/50
Total
–/1
 
Select the correct atom for each electron configuration.
1s22s22p
1s22s22p63s
3s23p6
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4. –/1 points TR3 11.P.04. My Notes
Question Part
Points
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1 2
–/1 –/0
0/50 0/50
Total
–/1
 
Hall effect data in an actual student laboratory was as follows.
I = 100 mA
B (mT)VH (mV)
9 2.1
14 3.2
25 5.8
30 7.0
40 9.3
49 11.4
57 13.2
63 14.6
For a doped indium arsenide strip of thickness 0.15 mm, with a current of 100 mA flowing through the strip and a magnetic field of 25 mT perpendicular to the strip, the measured Hall voltage was 5.8 mV.
(a) Use these data to find the density of charge carriers.
m-3
(b) Find the density of charge carriers using the complete data set shown in the table above.
m-3
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5. –/1 points TR3 14.P.14. My Notes
Question Part
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1 2 3
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0/50 0/50 0/50
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–/1
 
For each of the following forbidden reactions, select the conservation law(s) which is (are) violated.
(a) 2γ e + μ+ (b) e + nu bare 2γ (c) μ+ + e p + p



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