A photon has 8 point 0 times 10 to the negative 15 power cap j of energy. Planck’s constant is 6 point 6 3 times 10 to the negative 34 power times cap j times s What is the frequency of the photon?

Use the photon-energy equation E = hf, so the frequency is f = E/h. Substituting gives f = (8.0 × 10⁻¹⁵ J)/(6.63 × 10⁻³⁴ J·s) ≈ 1.21 × 10¹⁹ Hz. This matches choice D, 1.21 × 10¹⁹ Hz.

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