In an experiment on the photoelectric effect, a beam ofmonochromatic light is aimed at a nickel-plated cathode. Ascientist uses mathematical formulas to calculate the maximum speedof the electrons that the cathode releases. Which constant mostlimits the precision of the calculation?
the charge of one electron |
| the mass of an electron |
| the work function of nickel |
| Planck’s constant |
Which example illustrates a behavior called“photoconductivity”?
A metallic film conducts electricity when an electric potentialis applied across it.
A cathode emits electrons when it is struck by white light,which is a mixture of light of many frequencies.
A film with metallic properties becomes a better electricalconductor when light is shined upon it.
A cathode emits electrons when monochromatic light of a certainfrequency strikes it.
