In a photoelectric effect experiment the stopping potential is:
Correct answer: A. The electric potential that causes the electronic current to vanish
- A. The electric potential that causes the electronic current to vanish
- B. The photon energy
- C. The kinetic energy of the most energetic electron ejected
- D. The energy required to remove an electron from the sample
Explanation
The electric potential that causes the electronic current to vanish - Correct: Stopping potential is the voltage needed to stop even the most energetic electrons from reaching the anode, making the photoelectric current zero
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Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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