modern physics 2009     trimester 3

Serway's Chapter 16 (on-line only) on Cosmology

course expectations   &   syllabus 
   

 
 
Tuesday,
  May 26

Wednesday,
May 27

Thursday,
May 28

Friday,
May 29

class
burning questions 2009 has been revised; perhaps look at the addenda to the questions-to-be- answered-in-class section at the very beginning

reading
(always done before class)


15(11)

things you should know the answer to before coming to class


in order to describe the electroweak force, I will first ask you to describe exactly what the electric force is....

how do you do that as compactly as possible?

why is the electric force related to the magnetic force?  is this why they need to be unified?


homework
(written assignments
to be turned in)


this week's homework is the questions/answers you volunteer in class
i.e.,
what YOU contribute to making the class interesting

web stuff

the Mystery of the Missing Neutrinos  -- this experiment won half of the 2002 Nobel Prize in Physics

Weighing in on the Neutrino Mass

-the other half of NP 2002

Super-Kamiokande detects neutrinos by electron scattering

the first neutrino image of the sun

Sudbury Neutrino Observatory
detection  physics





lab


bubble chamber lab due

bring bubble chamber sheet to class as I will ask you to do some things to make it easy for me to grade

news/discoveries
of the week
In Hot Pursuit of Fusion (or Folly)




 
Monday,
May 18
Tuesday,
May 19
Wednesday,
May 20
Thursday,
May 21
Friday,
May 22
class
altered schedule 
 
 
 bring bubble chamber sheet to class to work on
send me your 2 "burning questions" 
reading
(always done before class)
 review reading on quarks and gluons
15(8,9) ?
i dont have my book with me

 15(7)
but ONLY up to bottom of p. 567

&

15(10)
bring to class:
prediction of omega- rest mass
(with work & method shown, not just an answer)
9(2) on spin
have you digested all of 9(2)

[it wouldnt hurt to look at 9(1)]

have you read the 1-page strangeness section,
15(6)?
you should have read everything up through section 10 in chapter 15 by now


things you should
know the answer
to before coming
to class
so a proton is composed of 2 ups and 1 down....
a neutron of 2 downs and 1 up?

do the masses of the parts add up properly?
what does thi mean?

how can we measure a lifetime as short as 10-23 sec?

be able to explain the discrepancy between the proton masses and sum of the masses of the parts

how DO we measure a quark mass if we have never detected a free quark??


what mistakes were on the board in yesterday's class?


homework
(written assignments
to be turned in)


work on
bubble chamber
lab


15(9)
show all work!

bending angle of light that just grazes the sun's surface
(in seconds of arc)




15(16)

&

9(7)
web stuff
 
 
 
 
 
lab
 
 
 
 
bubble chamber lab due next wednesday 
news & discoveries
 
 
 
 


 
  Monday,
May 11
Tuesday,
  May 12

Wednesday,
May 13

Thursday,
May 14

Friday,
May 15

class

bring bubble chamber sheet with
a) all radii & angles of velocities measured
b) derivation of circle radius from chord length and "height" of arc above chord (on back of sheet)

to hand in for checks
bring to class written down:

deconstruct the two hexagons (p. 572) into triangles

show the commonality of each triangle at its center, with the differences at the vertexes

the particle book would be nice reference here, but also your text , the back of the "Fundamental Particles and Interactions" handout, and the on-line version of the particle book
particularly the baryons and meson sections
homework problems due
at 9 am today

see below
quiz on nuclear physics
&
relativistic collisions
(chapters 2, 13, 14 & conservation laws from 15)

where are the missing 27 Mev?
time to work on bubble chamber lab
reading
(always done before class)
15(8,9)
the blue handout on the Rutherford scattering experiment
(the discovery of the nucleus):

read up through equation 4(1), i.e., through 3 of the long pages
(each page is a double book page)
finish blue- handout reading....
 


things you should know the answer to before coming to class

what evidence was there (in 1964) that the baryons and mesons had parts (now called quarks)?


what is the experimental sign that an object is compsed of parts?

what could  Gellman predict (and he did!) about the missing particle at the bottom of  the bowling-pin  (p. 573) diagram?
(5 !! things should come to mind)


in th blue handout, know how EACH equation follows from those above


everything about nuclear physics and relativistic collisions!


homework
(written assignments
to be turned in)


see above:
bubble chamber measurements



turned in by 9 am:

no credit at all afterwards!

13(57),
and your choice of

13(59)
[because some people did horribly on the last C14-dating question]

OR

14(9)
[because some people still can't figure out how to conserve momentum....
by the way I would not suggest that you do the problem the way the book suggests.... instead do the problem in the frame of the target particle... and then just do conservation of momentum and conservation of energy]


web stuff
figure 16-15 of the
Chapter 16 (on-line only) on Cosmology
is what we talked about during class
on-line version of the
Particle Physics Booklet
from LBL/CERN



lab





news/discoveries
of the week







Monday,
May 4
Tuesday,
May 5
Wednesday,
May 6
Thursday,
May 7
Friday,
May 8
class
 
 
 
finish fusion

start bubble chamber lab
 
reading
(always done before class)
 14(3,6)
on fusion
 
review the fusion section again 
 
 15(1)
[Review 15(2, 3}
15(4,5)
things you should know the answer to before coming to class

try to make sense out of the figure at the top of page 522:

which currents (moving charges) are related to which magnetic fields?

in which direction are the forces produced by these magnetic fields?  is confinement of the plasma (ionized gas explained?

why do the graphs on page 520 turn upwards at higher temperatures?
can it be TOO hot for fusion to occur?

do you have a show/tell to present?
keep it simple!
it's not necessary to do complicated problems!!


homework
(written assignments
to be turned in)
13(58) if you are in calculus

14(7)
14(24)
 come and revise yesterday's homework problems if need be

14(27)



13(33,34)
web stuff
 
 
 
 
 
lab
 
 
 
lab E3 on radioactivity due today 
 
news & discoveries
 
 
 
 


 

Monday,
April 27
Tuesday,
April 28
Wednesday,
April 29
Thursday,
April 30
Friday,
May 1
class





reading
(always done before class)
examples 13-10,11
on pages 490-491

13(6)
14(1) and 14(4, first 2 pages)

on basics of nuclear fission
finish 14(4) and continue through page 516



read the lab, so you are prepared



things you should know the answer to before coming to class



what isotopes are used to date

a) the age of the earth (or other solar system objects)


b) the age of the oldest human bones

how/why C-14 dating works?  why that isotope?  how does C-14 get into things?




questions to know the answer to for class:

does a single uranium fission produce the kinetic energy announced in the book?
(a nice show/tell here)

why does the uranium fuel have to be enriched in some reactors?  how is the enrichment done?
(i.e., how is U-235 separated from the more abundant U-238)?  three methods -- all learned intro physics or chemistry should come to mind)!

why does a U-235 require a slow neutron for fission?
(you learned this in your first physics course!)

how do you slow neutrons down?
(you learned this in your first physics course!)
same questions as for wednesday

be prepared to answer a few in depth (using physics!)


homework
(written assignments
to be turned in)

1) problem 7 from the relativistic collision handout

2) 13(54a,c)

1) problems 3 & 9 from the relativistic collision handout

2) 13(38)

1) problem 10 from the relativistic collision handout

2)
web stuff





lab
make sure that you have a rough value for the top quark mass (and the neutrino momentum -- speed and direction) for class today
(you can get back half of the points you lost friday
if you do)

lab E2 due today


top quark lab due

we do
lab E3  on radioactive decay

news/discoveries
of the week






pages for april 2009

  pages for march 2009