What observation contradicts classical theory regarding the photoelectric effect?
Understand the Problem
The question is asking for an observation related to the photoelectric effect that goes against classical physics. It focuses on the implications of light frequency and how it affects electric current and kinetic energy. Essentially, it's looking for the statement that reflects a limitation in classical theory's understanding of these phenomena.
Answer
Instantaneous ejection of electrons beyond a frequency threshold, regardless of intensity.
The observation that the ejection of electrons is instantaneous once light with a frequency above a certain threshold shines on them, regardless of intensity, contradicts classical theory.
Answer for screen readers
The observation that the ejection of electrons is instantaneous once light with a frequency above a certain threshold shines on them, regardless of intensity, contradicts classical theory.
More Information
In classical physics, it was expected that the energy transfer process from light to electrons would take time, and that sufficient intensity (energy) would be needed, regardless of frequency, to eject electrons. The quantum explanation, involving photons, accounted for this instantaneous effect.
Tips
Common mistakes include confusing intensity with frequency in explaining electron ejection, and expecting a time delay before ejection occurs, contrary to actual observations.
Sources
- How do observations of the photoelectric effect contradict classical theory? - vaia.com
- 6.3: Photoelectric Effect - Physics LibreTexts - phys.libretexts.org
- Why can't the photoelectric effect be explained by the wave model? - byjus.com
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