In a photoelectric effect experiment at a frequency above cut off, the stopping potential is proportional to?
- the energy of the least energetic electron before it is ejected
- the energy of the least energetic electron after it is ejected
- the energy of the most energetic electron before it is ejected
- the energy of the most energetic electron after it is ejected
Explanation
The stopping potential is the voltage applied to the electrodes in a photoelectric effect experiment that just prevents the most energetic electrons from reaching the anode.
Since the kinetic energy of the ejected electrons is directly proportional to the frequency of the incident light (above the threshold frequency), a higher frequency light will result in more energetic electrons.
Therefore, the stopping potential, which is the voltage needed to completely stop these most energetic electrons, is also directly proportional to their energy.
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