How To Calculate The Energy of a Photon Given Frequency & Wavelength in nm Chemistry

TL;DR

Learn how to calculate the energy of a photon using different approaches, including frequency and wavelength, and explore sample calculations.

Transcript

in this tutorial we're going to focus on the different ways in which you can calculate the energy of a photon so here's the first type of problem that you might see so if you're given a frequency how can we calculate the energy of a photon you need to use this equation energy is equal to planck's constant times the frequency now the value of planck... Read More

Key Insights

• 🫤 Photon energy can be calculated using the equations E = hν or E = hc/λ, depending on whether frequency or wavelength is given.
• ✖️ To convert frequency from gigahertz to hertz, multiply by 10^9.
• 🤒 To convert wavelength from nanometers to meters, multiply by 10^-9.
• ✖️ The energy per photon can be multiplied by the number of moles or grams of photons to calculate the total energy emitted.
• #️⃣ Avogadro's number is used to convert from moles to photons.
• 🙂 Planck's constant (h) is 6.626×10^-34 J·s, and the speed of light (c) is 3×10^8 m/s.

Summary & Key Takeaways

• Method 1: Calculate photon energy using the equation E = hν, where E is energy, h is Planck's constant, and ν is frequency.

• Method 2: Calculate photon energy using the equation E = hc/λ, where c is the speed of light and λ is wavelength.

• Method 3: Calculate the total energy of multiple photons by multiplying the energy per photon by the number of moles or grams of photons.