Intensity Effect

Question

Increasing intensity above threshold changes?

RankGuru · Accepted Answer

1. **Photon Theory**: Light intensity represents the number of photons striking the surface per unit area per unit time (photon flux).
2. **One-to-One Interaction**: One photon interacts with exactly one electron. Higher intensity means more photons, thus more interactions.
3. **Result**: Each interaction above threshold emits an electron. Therefore, increasing intensity increases the **number of photoelectrons** emitted per second (saturation current).
4. **Distinction**: Intensity does NOT affect the energy of individual photons ($hf$), so it does not change $K_{max}$ or $V_0$.

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Intensity Effect

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