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(b) The first equation displayed above yields
Φ=
−
=
⋅
−=
hc
K
m
λ
1
1
1240
491
0 710
182
eV nm
nm
eV
eV.
..
19. (a) We use the photoelectric effect equation (Eq. 385) in the form
hc
/
λ
=
Φ
+
K
m
.
The work function depends only on the material and the condition of the surface, and not
on the wavelength of the incident light. Let
λ
1
be the first wavelength described and
λ
2
be
the second. Let
K
m
1
= 0.710 eV be the maximum kinetic energy of electrons ejected by
light with the first wavelength, and
K
m
2
= 1.43 eV be the maximum kinetic energy of
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Work, Light

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