Prepared for Physics Extravaganza.
Went over demos.
Hung flyers.
Tuesday, May 20, 2008
Monday, May 19, 2008
Last class day before IB exam.
Handed out summary.
Went over radioactive decay - types of decay (alpha, beta, gamma)
Described the rules for writing decay equations.
Briefly describes classes of particles (leptons (light), hadrons (heavy), gauge bosons (interactions)). In equations, lepton number is conserved as is baryon number.
Hadrons consist of mesons and baryons (particles like proton and neutron)
Leptons include the electron and neutrinos.
Gauge bosons include the photon.
To conserve lepton number, in the decay of a neutron into a proton and electron, you must also have an anti-neutrino.
Went over several decay equations showing that nucleon number, charge number, baryon number and lepton numbers must be the same on both sides of the equation.
Problems in radioactive decay:
Two ways of looking at decay: delta N/delta t = - lambda * N
lamba is the decay constant = decay rate/number of remaining particles
A = Ao * (1/2)^(t/T 1/2)
T 1/2 is the half life
A is the amount remaining
Ao = original amount
The relation between the two ways of looking at decay is: lambda = ln 2/halflife
Students did several problems on radioactive decay.
**************
Went over photon energies when an electron changes energy levels. Calculated energies of photons, wavelengths, and frequencies.
Showed table of quantum numbers:
n = principal quantum number n = 1,2,3,4...
l = orbital quantum number. For a given n, l = 0, 1, 2, n-1
ml = magnetic quantum number. For a given n and l, ml = l, l-1, ...0, -1, -2, -l
ms = spin quantum number. For the electron, ms = 1/2, -1/2
Also handed out summary packets for astrophysics option.
Handed out summary.
Went over radioactive decay - types of decay (alpha, beta, gamma)
Described the rules for writing decay equations.
Briefly describes classes of particles (leptons (light), hadrons (heavy), gauge bosons (interactions)). In equations, lepton number is conserved as is baryon number.
Hadrons consist of mesons and baryons (particles like proton and neutron)
Leptons include the electron and neutrinos.
Gauge bosons include the photon.
To conserve lepton number, in the decay of a neutron into a proton and electron, you must also have an anti-neutrino.
Went over several decay equations showing that nucleon number, charge number, baryon number and lepton numbers must be the same on both sides of the equation.
Problems in radioactive decay:
Two ways of looking at decay: delta N/delta t = - lambda * N
lamba is the decay constant = decay rate/number of remaining particles
A = Ao * (1/2)^(t/T 1/2)
T 1/2 is the half life
A is the amount remaining
Ao = original amount
The relation between the two ways of looking at decay is: lambda = ln 2/halflife
Students did several problems on radioactive decay.
**************
Went over photon energies when an electron changes energy levels. Calculated energies of photons, wavelengths, and frequencies.
Showed table of quantum numbers:
n = principal quantum number n = 1,2,3,4...
l = orbital quantum number. For a given n, l = 0, 1, 2, n-1
ml = magnetic quantum number. For a given n and l, ml = l, l-1, ...0, -1, -2, -l
ms = spin quantum number. For the electron, ms = 1/2, -1/2
Also handed out summary packets for astrophysics option.
Thursday, May 15, 2008
Thursday, May 15, 2008
Went over problems from supplemental problem sheet on magnetism.
Handed out Atomic Physics packets to IB students.
Handed out Atomic Physics packets to IB students.
Wednesday, May 14, 2008
Wednesday, May 14, 2008
Went over RA 24.1
Discussed Faraday's and Lenz's Laws. Showed examples.
Demo of motor and generator.
Demo of magnet entering coil of wire.
Talked briefly about transformers.
We did problem 21 in class. Asked students to try the rest of the problems for homework.
Discussed Faraday's and Lenz's Laws. Showed examples.
Demo of motor and generator.
Demo of magnet entering coil of wire.
Talked briefly about transformers.
We did problem 21 in class. Asked students to try the rest of the problems for homework.
Tuesday, May 13, 2008
Tuesday, May 13, 2008
Went over first four problems on magnetic problem worksheet.
Gave quizzes on magnetism.
Handed out RA 24.1 due tomorrow.
Gave quizzes on magnetism.
Handed out RA 24.1 due tomorrow.
Monday, May 12, 2008
Monday, May 12, 2008
Went over RA 23.1.
Showed several examples of using the right hand rule:
a) JJ Thompson's discovery of the electron by measuring m/q
b) Hall effect showing that the charge carriers are electrons
c) mass spectrometer
Handed out RA 23.2, problems in magnetism, additional problems in magnetism
Asked students to do problems 1-4 in problems in magnetism sheet for tomorrow.
Showed several examples of using the right hand rule:
a) JJ Thompson's discovery of the electron by measuring m/q
b) Hall effect showing that the charge carriers are electrons
c) mass spectrometer
Handed out RA 23.2, problems in magnetism, additional problems in magnetism
Asked students to do problems 1-4 in problems in magnetism sheet for tomorrow.
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