http://www.ck12.org Chapter 5. Electrons in Atoms
a. Which series in hydrogen’s atomic emission spectrum is composed of visible light?
b. What are the similarities of each line of that series?Problems
- What is the frequency of electromagnetic radiation that has a wavelength of 0.325 cm? In what region of the
electromagnetic spectrum is this radiation located? - What is the frequency of a photon of light that has an energy of 2.95× 10 −^17 J?
- Answer the following:
a. Using the equationsE=hνandc=λν, derive an equation that expressesEas a function ofλ.
b. Use your equation from part a to determine the energy of a photon of yellow light that has a wavelength
of 579 nm. - The change in energy of a certain electron transition in the Paschen series is 1.82× 10 −^19 J. Calculate the
wavelength (in nm) of the spectral line produced by this transition.
Further Reading / Supplemental Links
- We are able to see the visible spectrum without help, but special equipment is required to view the infrared
spectrum. Have fun watching a demonstration using an infrared camera at http://www.dlt.ncssm.edu/core/Ch
apter8-Atomic_Str_Part2/irvideo-lg.htm. - Watch electrons in action as they light a fluorescent light bulb at http://www.youtube.com/watch?v=xFlWG
WXjD0o. - To understand waves better, you can visit these websites:
- Wave on a String Simulation: http://phet.colorado.edu/en/simulation/wave-on-a-string
- Radio Waves Electromagnetic Fields Simulation: http://phet.colorado.edu/en/simulation/radio-waves
- Measuring the Speed of Light With Chocolate: http://education.jlab.org/frost/speed_of_light.html
- Become Enlightened About Light: http://education.jlab.org/scienceseries/enlightened_about_light.html
- Bending Light Refraction: http://www.youtube.com/watch?v=_CL8Qzc0O8c
- Car Light Bends Animation: http://www.dlt.ncssm.edu/core/Chapter8-Atomic_Str_Part2/chapter8-Ani
mations/Car-LightBends.html - Explore how light interacts with the molecules in our atmosphere: http://phet.colorado.edu/en/simulati
on/molecules-and-light
- Compare the emission spectra of the sun with visible light at http://phet.colorado.edu/en/simulation/blackbody
-spectrum. - Get fired up at this interactive website: Anatomy of a Firework.
- Below are more links to simulations and videos of lab activities involving atomic spectra:
- Identifying Salts: http://freezeray.com/flashFiles/identifyingSalts.htm
- Cobalt Blue Glass Sodium Flame Test: http://www.youtube.com/watch?v=wTxPLqP5yGE
- Flame Tests of Metal Ions: http://www.youtube.com/watch?v=PJ0Vz7Wv9Rg
- Flame Tests of LiCl and LiNO 3 : http://www.youtube.com/watch?v=JvuS3J5M9Cw