1V = 1J/C
A. In SI units, 1 volt = 1 Joule/Coulomb. If an electron-volt (eV) is equal to the energy of 1 electron moved through a potential difference of 1 volt, how many joules is this? (Hint: what is the charge of one electron?)
B. A terahertz (THz) is 1012 hertz (Hz), and 1 Hz = 1 s–1. How many joule-seconds is 1 eV/THz?
C. Express Planck's constant h in units of eV/THz.
D. Express the number (0.5 eV)/(100 THz) in J-s.
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