Phys 273 Homework #1
due Sept 7, 2010
1-7. A thin circular hoop of radius a is hung over a sharp horizontal knife edge.
Show that the hoop oscillates with an oscillation frequency
.
1-8. A marble thro
Physics 273
Homework #11 SOLUTIONS
11.17
(a) film index n = (/0)1/2 = 2
-wave at wavelength (in film) /n=300nm is 75nm or 750
(b) From 11.16, we have the effective impedance of the -wave film is
Zeff
Physics 273 Homework #10
1. A particle of charge Q oscillates sinusoidally with frequency in the x-direction according to
x(t ) X 0 sin( t ) . We will study the resulting electromagnetic fields at a d
Physics 273 Homework #10
Due: Monday, November 28, 2011
1. A particle of charge Q oscillates sinusoidally with frequency in the x-direction according to
x(t ) X 0 sin( t ) . We will study the resultin
PHYSICS 273 HW #9 SOLUTIONS
9-20
Let the electric field be E0 sin kx t . Its energy density is
1
1
0 E02 sin 2 kx t with average 0 E02 . The kinetic energy density of electrons can be found from
2
4
Physics 273
Homework #7 Solutions
7.4
(a) For transverse waves on a rope, the force on longitudinal
section dx of the rope is the sum of the transverse components of
the tension on each end of section
Phys 273 Homework #5 solutions
5.9
(a)
Wave speed cw = (RT/M)1/2 = 343m/s for air at room temperature (=1.4)
so the wavenumber k = /cw = (2103rads/sec)/(343 m/s) = 18.3 rads/m
(b)
(c)
5.10
intensity
I
Phys 273 Homework 3 solutions
H&L 2-1. A wave can always be cast in the form f (x,t) = f (x+vt) for a wave
propagating along the x direction, and f (x,t) = f (xvt) for propagation along
the +x directi
Phys 273 Homework 2 solutions
4-8
4-14. (a) the full-width-half-max (FWHM) of a resonance curve is /Q, and
0
given that FWHM = 0.040 from the figure, then
Q = 1/0.04 = 25
(b) the damping constant is a
PHYSICS 273
PROBLEM SET #1 SOLUTIONS
September 13, 2011
1.7 The moment of inertia of a circular hoop of mass m and radius a rotating
about a point on its circumference is I = 2ma2. (Use the parallel a