See PDF: nuclearjeopardy14-15

• Find the energy in a quantum of light that has a frequency of 1.7E14Hz
  • Energy= 1.1E-19J

• Find the wavelength of a photon of light with energy 2.04eV in meters (1eV= 1.6E-19J)
  • HINT: must convert eV (USING DIMENSIONAL ANALYSIS) –> Joules, than can solve use E=hc/w
  • Wavelength= 6.10E-7m

• An electron in n=1 in an atom of hydrogen jumps to the n=3 state. What energy in eV is needed to make the transition? ADDED: calculation wavelength and frequency
  • Change in E= 1.93E-18J, –> convert using DIMENSIONAL ANALYSIS –> eV= 12.1eV;
  • Wavelength = 1.03E-7m
  • Frequency= 2.91E15Hz

• An electron in an excited hydrogen atom falls from n=5 to n=4. Find the wavelength in meters and frequency of the light produced.
  • HINT: Must calculate E first (E=4.88E-20J), then plug into E=hc/w
  • Wavelength = 4.07E-6m
  • Frequency = 7.37E13Hz