A 60W incandescent lightbulb releases about 5% of its energy in the form of visible light. Provide an order-of-magnitude estimate for the number of visible photons it emits every second. [energy of a photon]
Describe the setup and procedure of an experiment you could perform to measure the work function of an unknown conductive material, using only pieces of the material, wires, a lightbulb, a variable-voltage power supply, and a laser that outputs light at a fixed (and known) high frequency. [photoelectric effect]
1. A 60 W incandescent lightbulb releases about 5% of its energy in the form of visible light. Provide an order-of-magnitude estimate for the number of visible photons it emits every second. [energy of a photon]
2. Describe the setup and procedure of an experiment you could perform to measure the work function of an unknown conductive material, using only pieces of the material, wires, a lightbulb, a variable-voltage power supply, and a laser that outputs light at a fixed (and known) high frequency. [photoelectric effect]