Chapter 18

25 July 2022
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question
The chemical composition of the interstellar medium is basically sinlilar to that of (a) the Sun; (b) Earth; (e) Venus; (d) Mars.
answer
(a) the Sun
question
The density of atoms in the interstellar medium is most similar to (a) wildfire smoke; (b) dark rain clouds; (e) deep ocean water; (d) the interior of a TV tube.
answer
(d) the interior of a TV tube.
question
Of the following objects, the one that shines most like an emission nebula shines is (a) a regular incandescent Ughtbulb with a filament; (b) a red hot ember from a campfire; (e) a glOWing fluorescent light tube; (d) a star like the Sun.
answer
(d) a star like the Sun.
question
Stars interact with emission nebulae by (a) exiting their atoms enough to emit light; (b) illuminating them like an ad vertising billboard; (e) causing them to contract; (d) heating them so they explode.
answer
(a) exiting their atoms enough to emit light;
question
A dark interstellar globule is about the same size as (a) a cloud in Earth's atmosphere; (b) the entire planet Earth; (c) a star like the Sun; (d) the Oort cloud.
answer
(d) the Oort cloud.
question
he Ophiuchi cloud, shown in Figure 18.13 ("Dark Dust Cloud"), is dark because (a) there are no stars in this region; (b) the stars in this region are young and faint; (c) starUght from behind the cloud does not penetrate the cloud; (d) the region is too cold to sustain stellar fusion.
answer
(c) starlight from behind the cloud does not penetrate the cloud
question
If a proton and an electron within a hydrogen atom initially have parallel spins, then change to have anti-parallel spins, the atom must (a) absorb energy; (b) emit energy; (c) become hotter; (d) become larger.
answer
(b) emit energy
question
Of the following telescopes, the one best suited to observing dark dust clouds is (a) an X-ray telescope; (b) a large visible light teleseope; (e) an orbiting ultraviolet telescope; (d) a radio telescope.
answer
(d) a radio telescope.
question
Of the following, the largest interstellar clouds are (a) molecular clouds; (b) dark dust clouds; (e) emission nebulae; (d) globules.
answer
(a) molecular cloud
question
Molecular clouds are routinely studied using spectral lines from all but which of the following? (a) Molecular hydrogen; (b) Carbon monoxide; (e) Formaldehyde; (d) Water.
answer
(a) Molecular hydrogen