Science, Tech, Math › Science Energy from Frequency Example Problem Spectroscopy Example Problem Share Flipboard Email Print If you know the frequency of a laser beam, you can calculate the energy of a photon. Donald Iain Smith / Getty Images Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Todd Helmenstine Todd Helmenstine is a science writer and illustrator who has taught physics and math at the college level. He holds bachelor's degrees in both physics and mathematics. our editorial process Todd Helmenstine Updated December 05, 2018 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 1014 Hz. What is the energy of one photon? Solution: E = hν whereE = energyh = Planck's constant = 6.626 x 10-34 J·sν = frequencyE = hνE = 6.626 x 10-34 J·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.