Friday 27 May:  

 Demo's  

Fri 27 May: Auto Safety

Wed 1 Jun Review for final

Final: Thurs & Fri 2 & 3 June

Mon & Tues 6 & 7 June (Sub)

L#90: 1, 2, 8, 9, 12, 14, 15, 20  

(EM Radiation) Wed 8 May

Mouse Trap Car Thurs 9 June

L#91: 1, 2, 4, 5, 12 - 15, 20  

(EM Radiation) (due Fri 10 Jun)

L#93/95/96 (Relativity) (non-Sr's)

#93:1 - 3, 17, 18  #95: 1, 2, 6

#96: 1, 2, 5, 7

(due Mon 13 Jun)

#98 (Half-Life): 1 - 4, 6, 7, 10, 14, 16, 19,   (due Tues 14 June)

Wed Review Modern

Test: Thurs (90 - 98)

______

n   Important Einstein:

n    Photoelectric Effect (PEE)

Fig. 3-1: Einstein's Explanation of Photoelectric Effect ^*

               K (Kinetic Energy)

                  Freq of Photon

 K (Kinetic Energy)

           Intensity (number of) Photons

Intensity of photons depend on two things:

1. Energy of photon

2. Amount of photons

What photon energies can be found in the emission spectra of this atom after it has been excited to the n = 4 state? Remember, the greater the jump, the more the energy. Therefore, the higher the frequency of the photon.

l eV,  2 eV, 3 eV, 5 eV, 6 eV 

___

Half‑life:

The time it takes for ½ of the atoms to decay. If you have 200 atoms, how long will it take before you have 6 atoms left if the half-life is 15 days?

Start with  200 atoms

1^st ½ life: 100 atoms à 15 days

2^nd ½ life: 50 atoms à 30 days

3^rd ½ life: 25 atoms à 45 days

4^th ½ life: 12.5 atoms à 60 days

5^th ½ life: 6 atoms à 75 days

__________

L#98 (half- life)  98: 1-3, 5, 14,

  (due Tues 3 Jun)

Final: Wed/Thurs 3/4 June