Intensity Effect
Mediumphysics
Increasing intensity above threshold changes?
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Solution
Incorrect! Answer:
Increases photoelectron count
- Photon Theory: Light intensity represents the number of photons striking the surface per unit area per unit time (photon flux).
- One-to-One Interaction: One photon interacts with exactly one electron. Higher intensity means more photons, thus more interactions.
- Result: Each interaction above threshold emits an electron. Therefore, increasing intensity increases the number of photoelectrons emitted per second (saturation current).
- Distinction: Intensity does NOT affect the energy of individual photons (hf), so it does not change Kmax or V0.
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About This Question
- Subject
- physics
- Chapter
- dual nature
- Topic
- intensity effect
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Increases photoelectron count
- Photon Theory: Light intensity represents the number of photons striking the surface per unit area per unit time (photon flux).
- One-to-One Interaction: One photon interacts with exactly one electron. Higher intensity means more photons, thus more interactions.
- Result: Each interaction above threshold emits an electron. Therefore, increasing intensity increases the number of photoelectrons emitted per second (saturation current).
- Distinction: Intensity does NOT affect the energy of individual photons (hf), so it does not change Kmax or V0.
This medium difficulty physics question is from the chapter dual nature, covering the topic of intensity effect. It appeared in the 2025 exam.
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