MODERN PHYSICS (LOOSELEAF)
4th Edition
ISBN: 9781119495550
Author: Krane
Publisher: WILEY
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A negative helium ion would attract additional electrons.
O True
O False
For a K*- CF ion pair, attractive and repulsive energies E, and ER, respectively, depend on the distance
between the ions r, according to
1.436
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5.8 x 10-6
ER =
For these expressions, energies are expressed in electron volts per K*- Cl- pair, and r is the distance in
nanometers.
a) If the net energy EN is just the sum of the two expressions above: EN = E+ ER, Find the values
of r, and E,?
b) If curves of E,, ER and EN are
plotted in given figure, compare
E,
the calculated values of ro and E,
with that from the graph.
-0.28 nm
E,-4.6 eV
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0.40
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0.80
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A charged object has 82 protons, 82 neutrons, and 109 electrons on it. a) What is the element? b) What is its overall charge in C (be sure to include the sign!).
Chapter 8 Solutions
MODERN PHYSICS (LOOSELEAF)
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