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Home Q & A Board Science-Related Homework Help Physics
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doit_the_clown doit_the_clown
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7 years ago
Radio waves of 21-cm wavelength originate from which component of the interstellar medium?
A)   Cool, neutral atomic hydrogen   C)   Cool, carbon monoxide, CO
B)   Cold, molecular hydrogen, H2   D)   Hot, ionized atomic hydrogen
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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discovererdiscoverer
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7 years ago
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doit_the_clown Author
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7 years ago
Good timing, thanks!
veronee_madison
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Yesterday
Thanks
wyq2651
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2 hours ago
Helped a lot
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