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In photoelectric experiment energy of 2.48 eV irradiates a photo sensitive material. The stopping potential was measured to be 0.5 V. Work function of the photo sensitive material is

Asked in JEE Main 6th April 1st Shift 2024 · Work function and the photoelectric equation

• (1) 1.68 eV
• (2) 2.48 eV
• (3) 0.5 eV
• (4) 1.98 eV

Step-by-step solution

Why the other options are wrong

• (1) comes from subtracting 0.80 eV, a misreading of the 0.5 V stopping potential
• (2) comes from quoting the incident photon energy as the work function, that is ignoring the stopping potential
• (3) comes from quoting the stopping-potential energy itself instead of the work function

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