Light Emission Spectra & The Quantum Mechanical Model. “ The Sun ”. It is important to keep in mind that we can only ‘ see ’ a small fraction of the universe ’ s energy. The Visible light Spectrum. Light is characterized by frequency, or more commonly, by wavelength
& The Quantum Mechanical Model
It is important to keep in mind that we can only ‘see’ a small fraction of the universe’s energy
combined, white light
called additive color combination—works with light sources
White light contain all colors of light
Hot Matter in condensed states (solid or liquid or dense gas) nearly always emits radiation with a continuous spectrum.
When the atoms are in a condensed state, the electrons can make transitions not only within the energy levels of their own atom, but also between the levels of neighboring atoms.
Each element has different wavelengths of light given off when its electrons are excited - an atomic finger print
The white light passing through a cool gas can absorb wavelengths of light to create an absence of color.
The color of light given off depends on the amount of energy absorbed
The larger the atom the more energy can be absorbed, and more excitation lines produced
When the electron has its lowest possible energy, the atom is in its ground state.
Excitation of the electron by absorbing energy raises the atom from the ground state to an excited state.
A quantum of energy in the form of light (photon) is emitted when the electron drops back to a lower energy level.
Remember that each element has discrete emission lines that can be measured to define their “atomic fingerprint”
Mercury Vapor Lamp