MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
2nd Edition
ISBN: 9781337551779
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Chapter 9, Problem 11P
To determine
Find the energy of an electron in the 1s energy level in a hydrogen atom.
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Consider a copper wire with a diameter of 1.99 mm.
(a) What is the drift speed of the electrons in the copper wire when a current of 13.0 A flows through it? Assume that each copper atom
contributes one free electron to the metal. The density of copper is 8.92 g/cm³.
x
How is the drift speed related to the current flowing in a wire? Consider the fact that there is one free electron per copper atom when
determining the charge density. m/s
(b) How does this drift speed compare to the random rms speed of an electron at 20.0°C? To make this comparison, determine the
random rms speed of an electron at 20.0°C using the ideal gas model and find the ratio of the two speeds.
Vims
Vd
Which one of the following is an allowable set of quantum numbers for an electron?
a. n= 2, l= 3 mi= -2, ms= +1/2
b. n= 1, l=1 mi= 1, ms= +1/2
c. n= 2, l= 1 mi= -1, ms= -1/2
d. n= 3, l= 2 mi= -1, ms= 0
B5
Chapter 9 Solutions
MindTap Engineering, 1 term (6 months) Printed Access Card for Dunlap's Sustainable Energy, SI Edition, 2nd
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