Canary Islands PAU Chemistry Practice Questions - Canary Islands PAU Chemistry Examination 2026 (Química 2o Bachillerato COPAU) Exam

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A violet laser emits electromagnetic radiation with a wavelength λ = 400 nm. What is the energy of a single photon emitted by this laser? (h = 6.626 × 10⁻³⁴ J·s, c = 3.00 × 10⁸ m/s)

2.65 × 10⁻¹⁹ J 1.99 × 10⁻²⁵ J 4.97 × 10⁻¹⁹ J 8.28 × 10⁻¹⁹ J

Correct Answer:

4.97 × 10⁻¹⁹ J

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