1
PHYS-271 HOMEWORK #3
Due on Friday March 11th 2011 at 9h25 in class
1. The slit experiments
a) A monoenergetic beam of electrons is incident on a single slit of width 0.50 nm. A
diraction pattern is formed on a screen 20 cm from the slit. If the distanc
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McGill University PHYS-271 MIDTERM EXAM SOLUTIONS
Friday March 1st 2013 8:35-9:25 CHEMISTRY MAAS-112
There are two pages, one recto one verso. On these, there are three sets of questions
to be answered or to be solved completely. Only paper and pencil i
PHYS 271: midterm solutions
Steven Bennett
1. While the stopping voltage is turned on, the energy absorbed from a single photon is
E1 =
hc
= + eVs ,
1
(1)
hc
and we can solve this equation to nd the work function = 1 eVs . After the stopping voltage is tu
PHYS 271: Intro. to Quantum Physics
Midterm Exam 2007
Version 1
Non-programmable calculators are allowed, and a formula sheet has been provided. There are 20 questions in
total (10 short answer and 10 multiple choice). All answers should be indicated in y
PHYS 271: Intro. to Quantum Physics
Midterm Exam 2009
Version 3
Non-programmable calculators are allowed, and a formula sheet has been provided. There are 20 questions
in total (10 short answer and 10 multiple choice). Answers to short answer question mus
PHYS 271
Midterm Solutions Winter 2009
Question 1
Consider
p2
1
(1)
k x2 .
2m 2
In the ground state, we expect p = 0 , as the particle is not going anywhere on average,
E =
+
2
therefore p 2 = p . Also, we expect x will be the same as the classical lowest
Solutions to the Midterm
February 16, 2011
1
On the foundation of quantum physics
a) Einstein postulated that light can be considered as particles called
photons with an energy E = h. Photons interact with electron in an
elastic way.
b) W is not the funda