Lab 5 – Emission Spectra

Color Wavelength Light Waves Wavelength () Red Light – Longer Wavelength, Lower Energy Blue Light – Shorter Wavelength, Higher Energy

Formation of Emission and Dark Line Spectra

Kirchhoff’s Laws 1. A hot, dense glowing object (a solid or dense gas) emits a continuous spectrum. 2. A hot, low-density gas emits light of only certain wavelengths—a bright line spectrum. 3. When light having a continuous spectrum passes through a cool gas, dark lines appear in the continuous spectrum.

Hydrogen Atom 434 nm 656 nm 486 nm 410 nm -e -e -e -e -e 4000 Å 7000 Å 2 656 nm -e 1 -e +P 486 nm 410 nm -e -e 4000 Å 7000 Å

How to Excite an Atom 1. Absorption of a Photon Hydrogen Atom 2 3 4 Hydrogen Atom White Light Source 6563 Å -e -e 7000 Å 4000 Å

Aluminum Argon Calcium Carbon Helium Hydrogen Iron Krypton Magnesium Neon Nitrogen Oxygen Sodium Sulfur Xenon

The End