Question

A green laser pointer emits light with a wavelength of 529 nm. What is the energy of one of these photons

Answer 1

The energy of a photon emitted by the green light is 3.758 x 10⁻¹⁹ J

Step-by-step explanation:

Given;

wavelength of the photon, λ = 529 nm = 529 x 10⁻⁹ m

The energy of a photon emitted by the green light is given by;

`E = hf\\\\E = h((c)/(\lambda) )\\\\`

Where;

h is Planck's constant = 6.626 x 10⁻³⁴ J/s

c is speed of light = 3 x 10⁸ m/s

Substitute the given values;

`E = h((c)/(\lambda) )\\\\E =(6.626*10^(-34))((3*10^8)/(529*10^(-9)) )\\\\E = 3.758 *10^(-19) \ J`

Therefore, the energy of a photon emitted by the green light is 3.758 x 10⁻¹⁹ J