Practice question
Question
The work function of a metal is 1.5 eV . Light of wavelength 400 nm is incident on it. What is the maximum kinetic energy of emitted electrons in eV? (Take h c = 1240 eV nm )
Explanation
Given:
The work function of a metal is 1.5 eV . Light of wavelength 400 nm is incident on it. What is the maximum kinetic energy of emitted electrons in eV? (Take h c = 1240 eV nm )
Formula:
E = h c/lambda = 1240/400 = 3.1 eV.
Substitution & Calculation:
K_{max = E - phi_0 = 3.1 - 1.5 = 1.6 eV .
Final Result:
The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.
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