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Emission Spectra

Please answer using the attached data, procedure and graphs. Thanks.

1. Identify those which show what appears to be a continuous spectrum, those with emission spectra lines, those with absorption bands, and those with absorption spectral lines (these categories not being exclusive).

Extra Credit: The spectra of hydrogen, helium, and calcium are present. Try to find these spectra in a reference in order to identify these three.

2. Consider the plots of the intensity distributions for light from the bright side of the Earth, Mars, and Phobos shown below. The lower axis is plotted in wavenumbers (k), defined by k = 1 / λ. Note that when Iλ is plotted as a function of k, Wien's Law takes on a slightly different form from that given above, becoming (see attachment) where kmax is the wavenumber k when Iλ is maximum. Assume the smooth curves drawn above the measured intensities are blackbody distributions (with loss below that curve identifiable as due to gas absorptions), find the peak of the smooth curves, determine the wavelength of those points, and use Wien's law to estimate the radiation temperature of each body.

3. Note the absorption in the spectrum of the Earth's atmosphere identified by carbon dioxide (CO2), ozone (O3), and H2O. Which of these three gases shows in the spectra of the atmosphere of Mars?


Likely gases showing in the displayed spectra for the atmosphere of Mars: CO2, O3, H2O

Why do you think Phobos shows no gas absorption?


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The 6 pages solution provides complete explanations regarding the different types of emission spectra from different elements and compounds.