Worked Example Problem to Find Energy From Frequency

This example problem demonstrates how to find the energy of a photon from its frequency. Problem: The red light from a helium-neon laser has a frequency of 4.74 x 10​14 Hz. What is the energy of one photon? Solution: E hÃŽ ½ whereE energyh Plancks constant 6.626 x 10-34 JÂ ·sÃŽ ½ frequencyE hÃŽ ½E 6.626 x 10-34 JÂ ·s x 4.74 x 1014 HzE 3.14 x -19 J Answer: The energy of a single photon of red light from a helium-neon laser is 3.14 x -19 J.