21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 15, Problem 20QP
To determine

Relate the temperature difference between boiling water and hot oven with million kelvin regions of the interstellar medium.

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At the low temperature found in some interstellar molecular clouds (around 100 K), molecular oxygen emission is strongest at a wavelength of 0.2521 cm. Determine the speed (in km/s) of a low temperature molecular cloud containing molecular oxygen if its strongest emission is at a wavelength of 0.1885 cm. Note that this cloud is moving towards us, so the answer should be negative.
Based on what you know about observations of the interstellar medium at wavelengths other than for visible light, select all of the correct statements from the following list. -The 21-cm radio observations are of neutral hydrogen. -Much interstellar dust between stars is not visible. -The source of hot gas observed at X-ray wavelengths is not known. -All interstellar material is cool. -Interstellar dust is observed at ultraviolet wavelengths. -Giant molecular clouds consist mostly of CO molecules. -Material observed at wavelengths longer than that of visible light is usually cool.
Suppose you gathered a ball of interstellar gas that wasequal to the size of the Earth (a radius of about 6400 km). Ifthis gas has a density of 2.8 hydrogen atoms per cm3, typicalof the interstellar medium, what would its total mass be?  (For comparison, a bowling ball has a mass of about 5 kg)(HINT: 2.8 hydrogen atoms per cm3corresponds to a densityof 4.68 × 10−21 kg/m3)
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