ECE 302 Homework 7
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
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
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.
HW03 is due NOW!
HW04 has been posted.
Test #1 statistics
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).
Atoms with all but one electrons stripped
13.6 eV 2
n 2 a0
Bohrs theory can be adapted to other hydrogen-like systems.
Why is the theoretically-derived value of
HW04 is due NOW!
Reminder: Test #2 will be on next Wed (Oct
17). See the announcement on Blackboard for
Motion of the Nucleus
Center of mass:
MR = m0 r0 R =
m0 2 r0 = M 2 R =
4 0 ( R + r0 ) 2
Details about Test #2 have been posted to
Radiation from the Electron
According to the classical electromagnetic theory, the electron
in a hydrogen atom produces electromagnetic radiation, just
like an oscillating electr
Antimatter in the Milky Way
e + e+ +
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
The photoelectric effect is explained by:
Quantization of mass
Quantization of electric charge
Quantization of light
Classical theory of electromagnetism
Theory of relativity
Cathode Ray Revisited
HW3 has been posted.
HW2 may be picked up.
J.J. Thomson is generally recognized to be the one
Discovered the electrons.
Measured the mass of electrons.
Measured the electric charge of electrons.
ECE 302 Homework 3
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
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
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.
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
From Bragg condition
D sin = n
From de Brogile formula
2 m0 eV0
Louis de Broglies hypothesis can be stated as:
The energy of
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)