Transcript File

THIS
IS
With Your
Host...
Climates
Around
the world
Climate
Change
Convection
Current
Factors
Of
climate
Ka Boom
Whats in
the air?
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It’s a wave, it’s a
particle, It’s
photon man!
Exhilerating
Particles
Charmed, or
just plane
strange
Keep calm
and Kaon
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Let me
atom!
what a
mass
How many protons? How
many neutrons? What is it?
A 100
Protons 79
Neutrons 118
A 100
Rutherford (well, really his students) fired
a particle at a thin gold sheet
a) What particle did he fire ( type,
generation, and flavour)
b) what happened
c) What conclusions did he make?
A 200
Lepton, Electron, First Generation
A 200
State each of the flavours of quarks
and their respective generation and
charge.
Quarks have a fractional charge.
What does this mean?
A 300
The charge is a fraction of the charge of a
proton.
A 300
Tell me about baryons and
mesons… give me 2 common
examples of each.
A 400
Made up of quarks
Baryons have 3 *proton,
neutron
Mesons have two… quark
and antiquark.
Pions *ups and downs* and
Kaons *strange*
A 400
All normal matter that we
find here on earth is made up
of which three fundamental
particles?
A 500
Up quark, down quark,
electron (yes, there are
neutrinos as well, but they are
flying around solo on their
own instead of contributing to
what matters... Which is
matter.)
A 500
What is the purpose of the
electric field in a particle
accelerator?
What is the purpose of the
magnetic field?
B 100
electric field - give energy to
the particles
magnetic field - turn the
particles in a circle
B 100
Two particles collide, but one is at rest.
Under what condition would their paths after
the collision be less than 90 degrees?
Could this happen to two particles that are
the same thing?
B 200
The incoming particle is more
massive than the stationary
particle.
Yup, high energy particles are
MASSIVE!
B 200
Derive the frequency of the alternating
current source in a cyclotron using the
equations on your equations sheet. Define
all your variables.
What happens to the frequency necessary
as the particle approaches the speed of
light?
B 300
f = eB/(2pim)
BONUS: A lower
frequency is necessary as
the particle gains mass
B 300
One type of particle accelerator (okay, more
than one type, but use the one in the book)
uses both electric AND magnetic fields. Which
is it? Explain how they are positioned and
used. (TIP: With explain questions, diagrams,
equations, and of course explanations are
good and useful. EXTRA TIP: Sometimes we
don’t know if an examiner workes best by
being pushed or drinking coffee… best to look
at both forces and energy
B 400
Cylclotron
B 400
B 500
B 500
cam00037
C 100
Wonderfully Strange
But we will call it a strange antiquark because it
definitely has a positive value!
C 100
cam00039
C 200
Clearly charmed
Possibly Truth and Beauty as
well.
Could be a whole Baryon!
C 200
What did the subatomic particle say to the
duck?
C 300
quark quark
C 300
DAILY
Place A Wager
DOUBLE
C 400
What makes up Hydrogin?
C 400
Water and gin!
And I bet you were thinking:
an electron and a
proton ( up up down quarks,
and gluons)
That’s hydrogen.
C 400
Ana and Ere go out for dessert. Ana
looks at her friend and says <<you have
pie on your face>>
A moment later her friend asks <<is it
still there?>>
Ana replies <<yup>>
The friend informs Ana that it must not
be pie on her face.
Who is the friend and how does she
know this? What is it?
C 500
Andere knows that pion is a meson… it is
made up of a quark and an antiquark and
has a short lifetime (well, short is all
relative, short compared to the lifetime of
anything living. Lifetime is a funny word
for things that aren’t living).
It must be baryons on her face!
C 500
What conservation laws apply during
particle interactions?
D 100
Conservation of Charge
Conservation of Momentum
Conservation of Energy (mass energy)
(Conservation of baryon number)
D 100
A neutral kaon particle has a
mass of 497.614±0.024
GeV/c2
What is this in kg?
D 200
(8.85753 plus or minus
0.0004272) x 10-28 kg
D 200
A neutral Kaon particle containing an
antistrange quark decays into a positively
charged and negatively charged pion.
a) How might this look in a detector
b) Write an equation to represent the
event.
c) Write the quark structure of each.
D 300
Kaon: down antistrange or
antistrange down
Positive pion: up antidown
Negative pion: down antiup
D 300
An eta (sexy n) particle decays into a
positive pion, and two different kaons.
The structure of the eta particle is a
charm anticharm pair. Write an
equation for this interaction and the
quark structure for each of the
particles. Make sure you can explain
how you arrived at your answer.
D 400
D 400
D 500
D 500
What phenomenon can be used to
demonstrate the wave properties
of electrons? Details of any
apparatus used are not required.
E 100
electron diffraction OR electron
interference/superposition
E 100
(b) Calculate the de Broglie
wavelength of electrons travelling at
a speed of 4.50 × 105 m s–1.
(c) The muon has a mass equal to 207
times the mass of an electron.
Calculate the speed of muons with
the same de Broglie wavelength as
the electrons in part (b).
E 200
(b) Calculate the de Broglie wavelength of electrons
travelling at a speed of 4.50 × 105 m s–1.
λ dB= h/p = h/mv
λ dB = 6.63 × 10–34/(9.11 × 10–31 × 4.50 × 105)
λ dB = 1.6 × 10–9 m
(c) The muon has a mass equal to 207 times the mass of an
electron. Calculate the speed of muons with the same de
Broglie wavelength as the electrons in part (b).
v = h/mλ dB
v = 6.63 × 10–34/(1.6 × 10–7x (207 × 9.11 × 10–31 ))
v = 2170
v = 2200 m s–1
E 200
Solve for the wavelength of the
wave of a particle in terms of it’s
kinetic energy.
E 300
E 300
(a) Electrons behave in two distinct ways. This is
referred to as the duality of electrons.
(i) State what is meant by the duality of
electrons.
(ii) Give one example of each type of behaviour of
electrons.
E 400
Duality of electrons means that electrons behave as
both particles and waves
particle behaviour: deflection of electrons in an
electromagnetic field
wave behaviour: electron diffraction
E 400
An incident electron of kinetic energy 4.1 × 10–18 J and speed
3.0 × 106 m s–1 collides with the atom represented in the
diagram and excites an electron in the atom from level B to
level D.
a) For the incident electron,
calculate
(i) the kinetic energy in eV,
(ii) the de Broglie wavelength.
(b) When the excited
electron returns directly
from level D to level B it
emits a photon. Calculate the
wavelength of this photon.
E 500
(i) the kinetic energy in eV,
Ek. = 4.1 × 10–18/1.6 x 10-19 = 25.6 eV
Ek = 2.6 eV
(ii) the de Broglie wavelength.
λ
dB=
h/p = h/mv
λ dB= 6.63 x 10-34/ (9.11 x 10-31 x 3.0 × 106)
λ
dB=
λ
(b)
2.42 × 10–10 m
dB=
2.4 × 10–10 m
ΔE = (-0.21 - (-0.90)) x 10-18 = 0.69 x 10-18J
ΔE = hf = hc/λ
λ = hc/ΔE
λ = (6.63 x 10-34 x 3.0 x 108)/0.69 x 10-18
λ = 2.9 x 10-7 m
E 500
F 100
Higgs Boson Particle
F 100
What type of particle is a
muon, what does it decay to,
and what is its charge?
F 200
Lepton, electron, -e
F 200
Rutherford was able to collect
evidence that an alpha particle is a
Helium nucleus. What evidence did
he collect, and what is happening on
an atomic level during this process?
F 300
Alpha particles were collected. When the
emission spectra was analyzed, it
matched that of helium. When an
electron is excited it can jump to a higher
energy level. When it drops down/jumps
down/ returns to original state it emits a
photon of energy.
BONUS: What would you expect to be
different if a muon or tau made this
jump?
F 300
The atomic bomb dropped on
Hiroshima had an explosive energy of
8.4 x 1013J. How many kilograms of
mass must have been converted into
energy in this explosion?
F 400
9.3 x 10-4kg
F 400
F 500
F 500
The Final Jeopardy Category is:
Earthquakes and Society
Click on screen to begin
List as many reasons as you
can think of why some
earthquakes have the same
magnitude but different
intensities. The team with the
most correct answers wins.
Click on screen to continue
Difference in building structure,
time of day, population density,
type of rock, etc.
Click on screen to continue
Thank You for Playing Jeopardy!