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NEET 2011 (AIPMT, Prelims) · Photoelectric Effect: Einstein's Equation

Photoelectric Effect: Einstein's Equation question from NEET 2011 (AIPMT, Prelims)

Q153NEET 2011 · AIPMT · PRELIMSEasy

Photoelectric Effect: Einstein's Equation

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

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Answer: (d)

Each photon must have $h\nu \ge \phi$ ; intensity or power only changes the number of photons.
So emission needs a minimum frequency (threshold frequency $\nu_0 = \phi/h$ ).
So the answer is (d) frequency.

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