Practice question
Question
A photon of wavelength 200 nm ejects an electron from a metal with a velocity of 6.62 × 10⁵ m s⁻¹. What is the work function of the metal? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹, mₑ = 9.1 × 10⁻³¹ kg)
Explanation
E ≈ 9.939×10⁻¹⁹ J. KE ≈ 1.994×10⁻¹⁹ J. W₀ ≈ 7.945×10⁻¹⁹ J.
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