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ASTRO HW ANSWERS
Terms in this set (41)
The Orion Nebula is made mostly of hydrogen. How do we know that?
Hydrogen lines dominate the nebula's spectrum
A certain hydrogen spectral line has wavelength 1875 nm when measured in the laboratory. That same line, when measured in a star, has wavelength 1872 nm. What can we say about the star?
Its spectrum is blueshifted so the star is moving towards us
The portion of the electromagnetic spectrm of light with the greatest energy has the [c] frequency and the [d] wavelengths
A neutral atom cannot emit light if all of the atom's electrons are in the ground state.
A solid, glowing-hot object will emit light over the full range of wavelengths resulting in a [e] spectrum. If a diffuse and relatively cool cloud of gas is located between the glowing, hot object and an observer, the observer will detect an [f] spectrum coming out of the cloud. Another type of spectrum is given off by a neon sign which is a tube of gas whose electrons are excited by an electric current. The mostly red light given off by the sign is in the form of an [g] spectrum.
Where is most of the mass in the Solar System located?
In the Sun
Which of the following statements about comets are true? Choose all that apply.
Comet tails are caused by evaporating water ice and other ices.
A comet's tail points away from the Sun.
Comets only have tails when they are in the inner Solar System.
Found mostly beyond neptune's orbit
develops a tail when in the inner solar system
found mostly between the orbits of Mars and Jupiter
What are saturn's rings mad of, mostly?
What are Jupiter and Saturn mad of, mostly?
Hydrogen & helium
What are Uranus and Neptune made of, mostly?
Methane, water, & ammonia
Which of the following best describes the conditions on the surface of Venus?
Very hot with very high pressure.
How do we know that the lunar highlands are an older surface than the lunar maria?
The highlands have more craters per square kilometer.
Which of the following statements about Earth's magnetic field are true? Choose all that apply.
It protects our atmosphere from charged particles that stream out of the Sun.
It interacts with the solar wind and stimulates auroras.
It is generated by electrically charged iron swirling in Earth's outer core.
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