Practice question
Question
A photon of frequency 6.0 × 10¹⁴ Hz strikes a metal surface with a work function of 2.5 × 10⁻¹⁹ J. What is the kinetic energy of the ejected electron? (h = 6.626 × 10⁻³⁴ J s)
Explanation
E = hν ≈ 3.976×10⁻¹⁹ J. KE = E - W₀ ≈ 1.476×10⁻¹⁹ J.
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