Photoelectric Effect
Tut 2

1. 1. A photon of light has a frequency 5 x 1016 Hz. Determine :
1.1. the energy of this photon
1.1.
1.2. the period
1.2.

2. A photon of light has wavelength of 4 x 10-8 m. Determine :
2.1. the frequency of the photon
2.1.
2.2. the energy of the photon
2.2.

3. The period of a light beam is 5 x 10-9s.
3.1. Calculate its frequency.
3.1.
3.2. Calculate the energy
3.2.

4. What is the kinetic energy of the photoelectrons in this example? (unrealistic values used)

4.
50J

5. What is the energy of the photons? (unrealistic values used)

5.
100J

6. What is the work function for this metal? (unrealistic values used)

6.
80J

7. Why will the photoelectric effect not occur in this example?

7.
The incoming photon has insufficient energy to overcome the work function of the metal. So electrons will not be ejected.

No matter how bright you make this beam of light, the photon energy would remain the same at 80J, and no electrons would be emmitted.




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