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In the photoelectric effect: 1. Emission depends on threshold frequency. 2. Higher intensity increases the number of electrons emitted.

1. Only 1
2. Only 2
3. Both
4. Neither 1 or 2

Correct answer: Both

Solution

Photoelectric emission occurs only when the incident light frequency is at least the threshold frequency. For a frequency above threshold, increasing intensity increases the number of emitted electrons, not their maximum kinetic energy.

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