Extremadura PAU Chemistry Practice Questions - Extremadura PAU Chemistry Exam - Química 2o Bachillerato UEx 2026 Exam

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A metal surface has a work function (threshold energy) W₀ = 4.41 × 10⁻¹⁹ J. What is the threshold frequency f₀ required to emit photoelectrons? (h = 6.63 × 10⁻³⁴ J·s).

4.41 × 10¹⁴ Hz 6.65 × 10¹⁴ Hz 1.50 × 10¹⁵ Hz 2.92 × 10⁻¹⁵ Hz

Correct Answer:

6.65 × 10¹⁴ Hz

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