The photon is sometimes referred to as a quantum of electromagnetic energy is a bundle of electromagnetic energy.

Photons is the basic unit that makes up all light. They are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle.

Often we use the units of eV, or electron volts, as the units for photon energy, instead of joules.

**Formula to calculate energy of a photon using the** **Planck’s equation.**

h is the Planck’s constant (6.63 * 10^-34 Joule seconds).

f is the frequency of the light in hertz.

**Example:**

A lamp emits a yellow light with a frequency of 5.0 x 10 ^14 Hz. Calculate the photons energy. (h = 6.63 * 10^-34 Js )

Therefore, the photons energy is 3.32 x 10 ^ -19.

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