Frequency and Energy

Question

What is the frequency of a photon if the energy is 5.16 × 10⁻¹⁹ J? (h = 6.626 × 10⁻³⁴ J • s)

Answer 1

For a photon, the energy follows Planck's law:

E = h * f

We are given E and h, and we want to find f. So we divide:

E / h = f

( 5.16 * 10^(-19) J / 6.626 * 10^(-34) J * s ) = f

7.79 * 10^14 ( units of 1/s, or Hz ) = f