Get Solutions: photoelectric worksheet and Quantum numbers and selection rules worksheet

Electronic Materials – EE Science 1

Quantum Numbers and Selection Rules Worksheet

Diagram showing state transitions resulting in photon emission

Energies of the energy levels referenced to          = 0

Summer 2020

1. Redraw the photon emission diagram to show valid state transitions for photon absorption instead.

• Using selection rules, describe why the 2s state has no available transitions for photon emission.

• Using the chart for the energies associated with each energy level, determine how much energy is released for each of the following transitions:

1. n=4 to n=3

• n=4 to n=2

• n=4 to n=1

• n=3 to n=2

• n=3 to n=1

• n=2 to n=1

• Choose 2 of the transitions from (3) and determine the corresponding wavelengths and frequencies of the emitted photons.

• Provided a light source which ONLY emits 2482 nm light, do you expect to see any of the transitions shown? Why or why not?

Electronic Materials – EE Science 1

Photoelectric Worksheet

Current vs. applied voltage at same light wavelength but different intensities

Current vs. applied voltage at same saturation current but different wavelengths

Kinetic energy of emitted electrons vs wavelength of light for different cathode materials

1. Provide a potential explanation for what physically causes the different saturation currents in the first graph when the only difference between curves is the intensity of the impinging light.
2. Why is the ‘blocking voltage’ in the second graph becoming more negative as the wavelength of impinging light increases?
3. Propose an experiment that could be used to determine the composition of a material using the third graph and assuming you had prior knowledge that the material consisted of a single element.
4. Using the internet, find values for the work functions (Φ) of Cesium, Potassium, and Tungsten and calculate their corresponding ‘critical’ frequencies in Hz.
5. What are the corresponding wavelengths of light for the answers found in (4).
6. Which material requires the most work to free electrons from the surface?

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