Unformatted text preview: Stuff for Tuesday, April 5, 2011
Warm-up: A ﬂute and a clarinet are about the same length but
the clarinet plays lower notes. Why? (Also see
Quiz 2 will be on Thursday covering Q3 and Q4.
We meet tomorrow in Smith 1094 for the studio session (Q1/Q2).
Come at 2:30pm if you are able to, otherwise 3:30pm.
Photoelectric effect summary points
photon model: E = hf = hc /λ with hc ≈ 1240 eV · nm
electron maximum kinetic energy when ejected
Kmax = hf − W = hc /λ − W = e · Vf
W is the “work function” =⇒ least energy cost to free e−
Formulas for Quiz 2 (i.e., these will be given):
v = λf
ω = 2π f
d sin θnc = nλ
a sin θnd = nλ
E = hf =
K = hf −W
2(mc 2 )K
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