Which of the following photons has the lowest energy?
A)a photon from a green laser pointer with   532 nm
B)a photon from a tanning bed with   325 nm
C)a photon from a telescope with   700 nm
D)a photon from a quasar with   125 nm
E)a photon from a red LED bulb with   635 nm

Question

Quizplus · Accepted Answer

The energy of a photon is inversely proportional to its wavelength. Therefore, the photon with the longest wavelength has the lowest energy. Among the given options, a photon from a telescope with a wavelength of 700 nm has the longest wavelength, thus the lowest energy.

Which of the Following Photons Has the Lowest Energy