Ch11 HW3 (Homework)
Arthur Barfield
PHYS 2211, section M, Fall 2008
Instructor: Jennifer Curtis
Web
Assign
Current Score:
25 out of 25
Due:
Friday, December 5, 2008 09:00 AM EST
Description
Specific heat capacity of a solid
Instructions
Reading: Section 11.6 and previous sections.
On this assignment you are allowed three submissions per question part.
The due date for this assignment is past.
Your work can be viewed below, but no changes can be made.
1. [MI2 11.P.56.alt02]
14/14 points
The interatomic spring stiffness for
tungsten
is determined from Young's modulus measurements to be
90
N/m. The mass of one mole of
tungsten
is
0.185
kg. If we model a block of
tungsten
as a collection of atomic "oscillators" (masses on springs), what is one quantum of energy for one of
these atomic oscillators? Note that since each oscillator is attached to
two
"springs", and each "spring" is half the length of the interatomic bond,
the effective interatomic spring stiffness for one of these oscillators is 4 times the calculated value given above.
Use these precise values for the constants:
= 1.0546
10
34
J
·
s (Planck's constant divided by 2
)
Avogadro's number = 6.0221
10
23
molecules/mole
k
= 1.3807
10
23
J/K (the Boltzmann constant)
In order for WebAssign to be able to give you sensible feedback, you must give 5 figures in your answers for E and S. Otherwise there
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 Spring '09
 Kindermann
 Thermodynamics, Current, Energy, Work, Entropy, Heat, atomic oscillators

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