Krane - Modern Physics 2/e (Homework)

James Finch

Physics - College, section 1, Fall 2010

Instructor: Dr. Friendly

Current Score: 0/17

Due: Wednesday, November 10, 2010 20:00 EST

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Description

Here are some textbook questions from Modern Physics 2/e by Krane published by John Wiley & Sons, Inc. Click here for a list of all of the questions coded in WebAssign.

Instructions

This demo assignment allows many submissions and allows you to try another version of the same question for practice.

1. –/4 points Notes Question: Krane2 2.P.029.

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Find the kinetic energy of an electron moving at the following speeds.

(a) v = 1.30

10^-4c
eV
(b) v = 1.20

10^-2c
eV
(c) v = 0.250c
eV
(d) v = 0.959c
eV

2. –/3 points Notes Question: Krane2 3.P.003.

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Monochromatic X rays are incident on a crystal in the geometry of Figure 3.5. The first-order Bragg peak is observed when the angle of incidence is 37.0°. The crystal spacing is known to be 0.357 nm.


Figure 3.5		Figure 3.6

(a) What is the wavelength of the X rays?
nm
(b) Now consider a set of crystal planes that makes an angle of 46° with the surface of the crystal (as in Figure 3.6). For X rays of the same wavelength, find the angle of incidence measured from the surface of the crystal that produces the first-order Bragg peak.
°
At what angle from the surface does the emerging beam appear in this case?
°

3. –/3 points Notes Question: Krane2 5.P.021.

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(a) At the classical turning points ±A₀ of the simple harmonic oscillator, K = 0 and so E = U. From this relationship, show that A₀ = (

₀/k)1/2 for an oscillator in its ground state. (Do this on paper. Your instructor may ask you to turn in your work.)

(b) Find the turning points in the first and second excited states. (Use omega_0 for

₀, h for

, and k as appropriate.)

first	Enter a mathematical expression. 2
second	Enter a mathematical expression. 3

Click here for help with symbolic formatting.

4. –/3 points Notes Question: Krane2 6.P.035.

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In a muonic atom, the electron is replaced by a negatively charged particle called the muon. Suppose a particle similar to a muon and having a mass 247 times the mass of an electron replaces the electron in a hydrogen atom.

(a) What is the shortest wavelength of the Pfund series in this hydrogen atom?
nm
In what region of the electromagnetic spectrum does this belong?

gamma ray x-ray microwave ultraviolet visible light infrared radio

(b) How large is the correction for the finite nuclear mass in this case? (See discussion at the beginning of Section 6.8)

_corrected /

_previous =

5. –/4 points Notes Question: Krane2 7.P.002.

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(a) What are the possible values of l for n = 4? (Select all that apply.)	(b) What are the possible values for m_l for l = 1? (Select all that apply.)
1 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10	2 -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10

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Krane - Modern Physics 2/e (Homework)

Current Score: 0/17