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Understanding the Emission and Absorption Spectrum of Hydrogen

This educational resource explores the emission and absorption spectra of hydrogen, clarifying key concepts for students. The hydrogen emission spectrum consists of distinct bright lines at specific wavelengths, forming a pattern similar to a colorful rainbow. In contrast, the absorption spectrum features a continuous spectrum with dark lines corresponding to the wavelengths of emitted light. A student confuses the two, suggesting that the absorption spectrum is merely a lack of brightness at certain wavelengths. This document aims to address misconceptions and clarify how hydrogen interacts with light.

marjorie-lazos
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Understanding the Emission and Absorption Spectrum of Hydrogen

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Presentation Transcript

  1. What if Anything is Wrong Task – Light Emission

  2. View the emission spectrum for Hydrogen

  3. Describe the emission spectrum of Hydrogen • It is a continuous spectrum like a light bulb • It consists of bright lines at distinct colors • It is like a rainbow

  4. View the absorption spectrum for Hydrogen

  5. A student makes the following comment.Student: “In the absorption spectrum for hydrogen, the hydrogen emits a continuous spectrum except at the wavelengths corresponding to the lines in the hydrogen emission spectrum.”

  6. Answer the following on your own

  7. What if anything is wrong with the student’s statement? • The statement is correct • The light is emitted by a source different than the hydrogen. The missing lines have nothing to do with hydrogen • The hydrogen emits at all frequencies just a smaller amount for the dark lines • Hydrogen absorbs light from another source, and reemits in all directions reducing the brightness

  8. Consult with your neighbors and answer again.

  9. What if anything is wrong with the student’s statement? • The statement is correct • The light is emitted by a source different than the hydrogen. The missing lines have nothing to do with hydrogen • The hydrogen emits at all frequencies just a smaller amount for the dark lines • Hydrogen absorbs light from another source, and reemits in all directions reducing the brightness

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