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The History of the Electron

The History of the Electron. When we last left the atom, this is how it looked. But first, we have to talk about what a wave is. What makes up a wave? Wavelength ( λ ) – the distance form one point on a wave to the same point on the next wave.

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The History of the Electron

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  1. The History of the Electron When we last left the atom, this is how it looked

  2. But first, we have to talk about what a wave is. • What makes up a wave? • Wavelength (λ) – the distance form one point on a wave to the same point on the next wave. • Frequency – waves that pass a point per second • Amplitude – how far a wave rises or falls

  3. Wavelength and Frequency

  4. Waves and Energy • The higher the frequency, the higher the energy • The longer the wavelength, the lower the energy

  5. Electromagnetic Spectrum • What is an electromagnetic spectrum? • All of the frequencies or wavelengths of electromagneticradiation. • Spectrum from shortest wavelength to the longest • cosmic  gamma  X-rays  ultraviolet (UV)  visible  infrared (IR)  microwave  radar  TV  Radio

  6. A nicer Picture of the Electromagnetic Spectrum Remember the three L’s are on this side (Low energy, Low frequency, long wavelength) ROY G BIV backwards Red, Orange, Yellow, Green, Blue, Indigo, Violet

  7. Let’s Practice 1) What has the longer wavelength: X-rays verses visible 2) What has the longer wavelength: gamma verses cosmic 3) What has the higher energy: infrared verses radio 4) What has the higher energy: microwave verses infrared 5) What has the highest frequency: gamma verses radio 6) What has the highest frequency: TV verses UV

  8. See if you can find the humor in this:

  9. Now, how do waves relate to the atom? That brings us to Quantum Mechanics and a few more scientists

  10. Line Spectra of Excited Atoms • Excited atoms emit light of only certain wavelengths • The wavelengths of emitted light depend on the element.

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