Lab 5 emission spectra
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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.

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Color

Wavelength

Light Waves

Wavelength ()

Red Light – Longer Wavelength, Lower Energy

Blue Light – Shorter Wavelength, Higher Energy



Kirchhoff s laws
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

5

4

-e

434 nm

3

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

4

3

4000 Å

7000 Å

2

White Light Source

1

+P

6563 Å

Hydrogen Atom

-e

-e


Aluminum

Argon

Calcium

Carbon

Helium

Hydrogen

Iron

Krypton

Magnesium

Neon

Nitrogen

Oxygen

Sodium

Sulfur

Xenon



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