What is the energy of a photon with frequency 5.0 × 10¹⁴ Hz? Use h = 6.63 × 10⁻³⁴ J·s.
A3.3 × 10⁻¹⁹ J
B1.3 × 10¹⁹ J
C5.0 × 10¹⁴ J
D3.3 × 10⁻²⁰ J
Explanation
📌 E = hf = (6.63 × 10⁻³⁴)(5.0 × 10¹⁴) = 33.15 × 10⁻²⁰ = 3.3 × 10⁻¹⁹ J. Distractor B: wrong sign of exponent; C: reported f; D: off by factor of 10.