Practice question
Question
A metal has a threshold frequency of 4.8 × 10¹⁴ Hz. What is the kinetic energy of an electron ejected by light of frequency 7.2 × 10¹⁴ Hz? (h = 6.626 × 10⁻³⁴ J s)
Explanation
W₀ = hν₀. KE = h(ν - ν₀) ≈ 1.590×10⁻¹⁹ J.
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