ECE 302 Homework 7
COMER
1. Suppose that the random variable X is equal to the number of hits by a certain baseball player in his
next 3 at bats. If P (X = 1) = 0.3, P (X = 2) = 0.2, and P (X = 0) = 3P (X = 3), nd E [X ].
2. A coin that when ipped comes u
ECE 302 Homework 9
COMER
1. Two people decide to meet at a certain location. If the arrival times of the two people are independent
and uniformly distributed between 12:00 noon and 1:00 pm, nd the probability that the rst to arrive
has to wait longer than
ECE 302 Homework 2
COMER
1. (Problem 2.21) A die is tossed and the number of dots facing up is noted.
(a) Find the probability of the elementary events under the assumption that all faces of the die are
equally likely to be facing up after a toss.
(b) Fin
Lecture 16
HW03 is due NOW!
HW04 has been posted.
Test #1 statistics
Average: 48
Standard deviation: 22
Your test may be picked up after class or
between 11-12 tomorrow or email me.
Test #2 will be on Oct 17 (Wed).
Lecture 16
Thomsons Model
An atom
Lecture 19
Hydrogen-Like Atoms
Atoms with all but one electrons stripped
Energy level:
13.6 eV 2
En =
Z
2
n
Bohr radius:
n 2 a0
rn =
Z
Bohrs theory can be adapted to other hydrogen-like systems.
Lecture 19
Quiz
Why is the theoretically-derived value of
Lecture 18
HW04 is due NOW!
Reminder: Test #2 will be on next Wed (Oct
17). See the announcement on Blackboard for
details.
Lecture 18
Motion of the Nucleus
Center of mass:
R
m0
MR = m0 r0 R =
r0
M
C.M.
Newtons law:
e2
m0 2 r0 = M 2 R =
4 0 ( R + r0 ) 2
Lecture 17
Details about Test #2 have been posted to
Blackboard.
Lecture 17
Radiation from the Electron
According to the classical electromagnetic theory, the electron
in a hydrogen atom produces electromagnetic radiation, just
like an oscillating electr
Lecture 15
Antimatter in the Milky Way
e + e+ +
Lecture 15
Applications in Modern Medicine
Positron Emission Tomography (PET) Scan
A medical diagnostic to study the path and location of a
position-emitting radioactive chemical that has been
injected into
Lecture 14
Quiz
The photoelectric effect is explained by:
1.
2.
3.
4.
5.
Quantization of mass
Quantization of electric charge
Quantization of light
Classical theory of electromagnetism
Theory of relativity
Lecture 14
Cathode Ray Revisited
Wilhelm Rntgen
Lecture 13
HW3 has been posted.
HW2 may be picked up.
Lecture 13
Quiz
J.J. Thomson is generally recognized to be the one
who:
1.
2.
3.
4.
5.
6.
Discovered the electrons.
Measured the mass of electrons.
Measured the electric charge of electrons.
Measure
ECE 302 Homework 3
COMER
1. (Problem 2.69) A number x is selected at random in the interval [1, 2]. Let the events A = cfw_x < 0,
B = cfw_|x 0.5| < 0.5, and C = cfw_x > 0.75. Find P (A|B ), P (B |C ), P (A|C c ), P (B |C c ).
2. (Problem 2.75) Show that P
ECE 302 Homework 4
COMER
1. (Problem 2.46) Ordering a deluxe pizza means you have four choices from 15 available toppings.
How many combinations are possible if toppings cannot be repeated? Assume that the order in which
toppings are selected does not mat
Lecture 12
Discovery of Electrons
When a sufficiently high voltage is applied to the electrodes in
a vacuum tube (with pressure < 0.001 mm Hg), the glass
opposite to the cathode begins to glow, presumed to be due to
cathode rays emitted from the cathode.
Lecture 11
Homework (hw02) is due. If you have not turned it in yet,
please hold it until the end of the class.
There is no homework assignment for this week.
Reminder: Test #1 will be on Friday. See details at My
Blackboard.
Lecture 11
Quiz
There are
Lecture 21
Davisson-Germer Experiment
From Bragg condition
D sin = n
From de Brogile formula
h
= =
p
h
1.226 nm
=
2 m0 eV0
V0
Lecture 21
Higher-Order Interference
Lecture 21
Quiz
Louis de Broglies hypothesis can be stated as:
1.
2.
3.
4.
5.
The energy of
PHY 342
Modern Physics Fall 2016 Prof. Yong P. Chen TA: Zhen Hua
Homework 2. Posted on Mon. 08/29 Due 09/06 Tuesday by 5pm in PHYS Rm 144
(Please write down the name of course (PHYS 342) and TA (Zhen Hua) when turning- in your
homework to Rm 144)
This HWK