A certain shade of blue has a frequency of 7.24 * 1014 Hz. What is the energy of exactly one photon of this light?

E = hf

E = 6.63 * 10 ⁻³⁴ * 7.24 * 10¹⁴

E = 4.80012 * 10⁻¹⁹ J

The energy of the photon is proportional to frequency of the photon. The constant of proportionality here is called Planck's constant with a value of 6.62607004 * 10-34 m2 kg / s. In this case, substituting to the formula E = h v where h is the constant and v is the frequency, the answer is 4.80 * 10^-19 Joules