Practice question
Question
A metal has a threshold wavelength of 450 nm. What is the kinetic energy of an electron ejected by light of wavelength 300 nm? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)
Explanation
W₀ ≈ 4.417×10⁻¹⁹ J. E = 6.626×10⁻¹⁹ J. KE ≈ 2.209×10⁻¹⁹ J.
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