Practice question
Question
A photon of energy 6.626 × 10⁻¹⁹ J ejects an electron from a metal with a kinetic energy of 2.0 × 10⁻¹⁹ J. What is the stopping potential of the electron? (e = 1.6 × 10⁻¹⁹ C)
Explanation
Vₛ = KE/e = 1.25 V.
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