That Smudge on the X-ray is from my Jelly Donut.

Photoelectric Effect
http://www.lon-capa.org/~mmp/kap28/PhotoEffect/photo.htm

More visual Photoelectric effect:
http://phet.colorado.edu/simulations/photoelectric/photoelectric.jnlp

Solutions:
2000B5
a)
i) 4.5 eV or 7.2 x 10^-19 J
ii) 1.26 x 10⁶ m/s
b) 183 nm
c) 5.56 x 10¹⁴ Hz

1980B3
a) The graph should be straight forward, but you SHOULD know that all four points cannot be on the same line!
b) 0.75 x 10¹⁴ Hz
c) 3.1 eV
d) Energy of electrons is 5 eV according to data, so the stopping potential will be 5 volts.
e) Charges move in circular paths when they are in a magnetic field perpendicular to their velocity. This is a possible reason for this behavior.

Page 855:
16. 4.14 x 10¹⁴ Hz

17. 401 nm

19. The shortest visible wavelength photons have energies of 3.1 eV (400 nm wavelength). Copper and Iron have work functions that are greater than this, so they will not eject photo electrons in visible light.
20.

a) 3.49 x 10^-19 J or 2.179 eV.
b) 0.930 V

Page 885:
P32. 4.14 x 10^-11 m (Don't worry about the longest wavelength.)
P33. 41,000 V