NEET 2026 Physics question
A ray of light with wavelength is incident on three different photoelectric cells namely 1, 2 and 3. The threshold wavelength of these photoelectric cells are , , and , respectively and the magnitude of stopping potentials of these cells are , and , respectively. The relation between and threshold wavelengths are , and . The correct option is:
Answer: (1)
Solution
Photoemission occurs only if (threshold wavelength), and . Cell 1: means the photon energy is less than the work function, so no emission and . Cell 2: , emission occurs with
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