Photoelectric emmision occurs only when the incident light

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Photoelectric emmision occurs only when the incident light has more than a certain minimum

1. power
2. wavelength
3. intensity
4. frequency

Correct Option: D

For occurence of photoelectric effect, the incident light should have frequency more than a certain minimum which is called the threshold frequency (v₀).
We have,

	1	mv² = hv - hv₀
	2

For photoelectric effect emission ν > ν₀
where ν is the frequency of the incident light.