Practice question
Question
A photon of energy 5.0 × 10⁻¹⁹ J strikes a metal with a work function of 3.5 × 10⁻¹⁹ J. What is the velocity of the ejected electron? (mₑ = 9.1 × 10⁻³¹ kg)
Explanation
KE = 1.5×10⁻¹⁹ J. v = √(2KE/m) ≈ 5.74×10⁵ m s⁻¹.
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