Question

What is the energy of a photon with a frequency of 1.7 × 1017 Hz? Planck’s constant is 6.63 × 10–34 J•s.

1.1 × 10–17 J
1.1 × 10–16 J
8.3 × 10–16 J
8.3 × 10–15 J

Answer 1

E = h f = (6.63×10⁻³⁴ J·s)(1.7×10¹⁷ s⁻¹) = 11.271×10⁻¹⁷ J = 1.13×10⁻¹⁶ J ≈ 1.1×10⁻¹⁶ J.

Answer: 1.1 × 10⁻¹⁶ J.