Energy Unit Energy of an Electron.

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Presentation transcript:

Energy Unit Energy of an Electron

The Wave-like Electron The electron propagates through space as an energy wave. To understand the atom, one must understand the behavior of electromagnetic waves. Louis deBroglie

Wave-Particle Duality JJ Thomson won the Nobel prize for describing the electron as a particle. His son, George Thomson won the Nobel prize for describing the wave-like nature of the electron. The electron is a particle! The electron is an energy wave!

Electromagnetic Radiation: Energy that moves through space and matter both in the form of magnetic and electric waves and in the form of a stream of particles.

Waves Amplitude = height of wave Trough = the lowest point of a wave. Waves are described by their amplitude, wavelength, crest, and troughs. Amplitude = height of wave Trough = the lowest point of a wave. Crest = the highest point of a wave.

Wave Characteristics Wavelength Frequency The distance between two consecutive wave peaks. Frequency How many wave peaks pass a certain point per given time period.

Photons Stream of tiny packets of energy… LIGHT

Electromagnetic radiation propagates through space as a wave moving at the speed of light. -speed of light is 3.0 x 108 m/s

The energy (E ) of electromagnetic radiation is directly proportional to the frequency () of the radiation.

Different wavelengths of electromagnetic radiation carry different amounts of energy. Red light carries less energy than blue light. The longer the wavelength of light, the lower the energy of its photons. Copyright © by McDougal Littell. All rights reserved.

Long Wavelength = Low Frequency = Low ENERGY Short Wavelength= High Frequency = High ENERGY

fireworks Fireworks use the emission of photons to display the fantastic colors.

Photon Emission

Remember that different wavelengths of light carry different amounts of energy per photon. Copyright © by McDougal Littell. All rights reserved.

The energy is said to be emitted in “discrete” amounts Only certain types of photons are produced...we don’t see all colors only selected colors. The energy is said to be emitted in “discrete” amounts Copyright © by McDougal Littell. All rights reserved.

Atoms have certain discrete energy levels. energy levels are quantized Atoms have certain discrete energy levels...energy levels are quantized...only certain values are allowed. More like fig. b Copyright © by McDougal Littell. All rights reserved.

Spectroscopic analysis of the visible spectrum… …produces all of the colors in a continuous spectrum

Spectroscopic analysis of the hydrogen spectrum… …produces a “bright line” spectrum

Element Spectra