<4.1>
(a)
hc
5 kT
(b) When 0 , e
, so I ( , T ) 0 .
hc
When , e kT , again I ( , T ) 0 .
5
<4.4>
(a) (b)
I=
2 hc
(c)
2
5
5
hc
0
e
kT
d =
1
2 hc
5
2
0
(
hc 5 5
)x
2 k 4T 4
1
kT
dx =
ex 1 x2
h3c 2
0
2 5 k 4T 4
x3
dx =
15h3c 2
ex 1
p = T 4 4 R 2 = 7.95w
<4
<1.4> 90 .
in the cart frame, the cannonball has the same velocity in x direction with the cart.
<1.6> In M frame vM =0 vm = v0
After collision vM =0 vm =- v0
In lab frame vM =- v0 vm =-2 v0
<1.9> (a) v = - 3 10 4 * 10 4 +29979 10 4 = 29976 10 4 m/s
(b) v
Practice problems. Test 1
1.1 Practice Problems 2.31, 2.37 and 2.28 in the Homework.
1.2 Concepts
What are the fundamental distinctions between an inertial and non-inertial frame of
reference.
1.3 Concepts
Relativity sets an upper limit on the speed that
PHYS 321
TEST1
<1.1>
a. 1900, Plank suggest that energy is radiated and absorbed in quantities divisible by discrete
energy element when he tried to solve black body radiation problem introduced by
Kirchhoff 1859
b. 1905, Einstein postulated that light it
TEST 2. PHYS 321. November 27, 2007
From 2:00 to 3:15pm. Lecture Hall. Steinman Hall
NAME:
You are allowed to have a sheet with equations.
1
1. Photoelectric eect. The work function of Cesium is 1.9eV. What is
the maximum wavelength of light that can ejec
TEST # 1. PHYS 204. SPRING 2005. 03/08/05
NAME:
1. (20 points) One of the harmonics on a string 1.30m long has a frequency
of 15.6 Hz. The next higher harmonic has a frequency of 23.4 Hz. Find (a)
the fundamental frequency, and (b) the speed of waves on t
TEST 1. PHYS 321. October 2, 2007
From 2:00 to 3:15pm. Room MR 418
NAME:
You are allowed to have a sheet with equations.
1
1.1 Concepts
Two observers are moving relative to each other. Which of the following
quantities will they always measure to have the