NEET Physics Photoelectric Effect MCQ Question
Consider a diagram of a photoelectric effect experiment showing a metal surface being illuminated by light of different frequencies. Which of the following labels correctly identifies the threshold frequency () for the metal used in the experiment?
The frequency of light below which no photoelectric emission occurs, regardless of intensity.
The frequency of light at which the intensity of the emitted electrons is maximum.
The frequency of light at which the stopping potential is zero.
The frequency at which all incident light results in photoelectric emission.
Correct Answer
Detailed Explanation
The threshold frequency () is defined as the minimum frequency below which no photoelectric emission is possible, even if the intensity is high, as per Chunk 1 of the NCERT context.
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