1 / 19

EMISSION SPECTRUM

EMISSION SPECTRUM. When Matter is heated it gives off light Example: light bulb The electrical energy absorbed by the filament excites the atoms ’ electrons The absorbed energy is eventually released in the form of light. CONTINUOUS (WHITE LIGHT) SPECTRA

lin
Download Presentation

EMISSION SPECTRUM

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. EMISSION SPECTRUM

  2. When Matter is heated it gives off light • Example: light bulb • The electrical energy absorbed by the filament excites the atoms’ electrons • The absorbed energy is eventually released in the form of light

  3. CONTINUOUS (WHITE LIGHT) SPECTRA When normal white light (such as light from the sun or a light bulb) is passed through a prism, the light separates into a continuous spectrum of colors

  4. PRISM • White light is broken into 7 spectral lights, what are they? ROY G BIV

  5. Originally Scientists (even Newton) thought that light was made up of particles but this couldn’t’ explain why different color were refracted differentNOTICE: Voliet bends a lot more than Red

  6. Light made up of waves

  7. Basic Wave Vocab

  8. Transverse vs Longitudinal Waves Transverse Longitudinal

  9. Wavelength vs. Frequency • WAVELENGTH = distance light travels to complete 1 cycle • FREQUENCY = number of cycles completed in 1 second

  10. The colors we see have different wave lengths • Red = longer wave length • Violet = shorter wave length ,lower frequency ,higher frequency Which one has the higher frequency? Wavelength and Frequency have an inverse relationship

  11. You can even calc. the Wave Velocity • speed of wave in direction is traveling • Velocity = wavelength x frequency Velocity = 

  12. Scientists realized that many light waves couldn’t been seen with the naked Electromagnetic Spectrum

  13. Lower Energy Higher Energy LINK

  14. THE MYSTERY OF EMISSION- LINE SPECTRUM Solids, liquids, and dense gases emit light of all wavelengths, without any gaps = Continuous Spectrum

  15. Thin gases emit light of only a few wavelengths = Emissions or Bright Line Spectrum

  16. Bright Line Spectrum • Atoms cannot emit energy continuously, rather they emit energy in precise quantities • How does this work • Electrons absorb energy (EXCITED) and “jump” to a higher energy level • After a short time, they “fall” back to lower energy level, giving off a specific amount of energy (a quantum of energy) in the form of a photon (light)

  17. Scientists of the 19th century quickly figured out that each element generates its own unique set of wavelengths of emissions and absorptions. Hydrogen:

  18. Neon line spectra

  19. Hydrogen jumps!

More Related