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Thornton and Rex - Modern Physics 4/e (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 17 / 17

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

Last Saved : n/a Saving...  ()

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Question
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1 2 3 4 5 6
–/1 –/1 –/2 –/2 –/8 –/3
Total
17/17 (100.0%)

  • Instructions

    The 4th edition of Modern Physics for Scientists and Engineers by S. Thornton and A. Rex, published by Cengage Learning, features WebAssign questions directly from the textbook with randomized variables, as well as supplementary multiple choice questions.

    The questions in the sample assignment span a broad range of topics covered by the textbook, including relativity, quantum theory and wave functions, atomic physics, semiconductors, nuclear physics, and particle physics.

    Question 2 uses physPad, which allows input of symbolic expressions.

    View the complete list of WebAssign questions available for this textbook. This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

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Assignment Scoring

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1. –/1 points TR4 2.P.021. My Notes
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1
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–/1
 
Particle physicists use particle track detectors to determine the lifetime of short-lived particles. A muon has a mean lifetime of 2.2 µs and makes a track 9.1 cm long before decaying into an electron and two neutrinos. What was the speed of the muon?
c
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2. –/1 points TR4 6.P.036. My Notes
Question Part
Points
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1
–/1
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–/1
 
One possible solution for the wave function ψn for the simple harmonic oscillator is the following.
Ψn = A(2αx2 − 1)e
−αx2
2
A is a constant. What is the value of the energy level En? (Use the following as necessary: ω, and h for Planck's constant.)
En =
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3. –/2 points TR4 8.P.018. My Notes
Question Part
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1 2
–/1 –/1
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–/2
 
(a) What are the possible values of Jz for the 62F7/2 state? (Select all that apply.)

(b) Determine the minimum angle between the total angular momentum vector and the z axis for this state.
°
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4. –/2 points TR4 11.P.008. My Notes
Question Part
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1 2
–/1 –/1
0/50 0/50
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–/2
 
What kind (p-type or n-type) of semiconductor is made if pure germanium is doped with a small amount of each of the following?
(a) aluminum

(b) selenium
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5. –/8 points TR4 12.P.042. My Notes
Question Part
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1 2 3 4 5 6 7 8
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
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–/8
 
Find which of the α and β decays are allowed for 219Ac. (Determine the disintegration energy Q for each decay which is allowed, and calculate the binding energy B against each decay which is not allowed.)
process Is it allowed?Q or B
α emission MeV
β- emission MeV
β+ emission MeV
electron capture MeV
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6. –/3 points TR4 14.P.014. My Notes
Question Part
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1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
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–/3
 
For each of the following forbidden reactions, select the conservation law(s) which is (are) violated.
(a) e + μ+ 2γ (b) μ+ + e p + p (c) 2e 2γ



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