SMT 314 - Introduction to Cosmology » Fall 2020 » HW2

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Question #1
A spectral line from the left side of Saturn's rings, as you see them from Earth's northern hemisphere, is at a wavelength's slightly shorter than the same spectral line measured from the right side of Saturn's rings. Which way (direction) is Saturn rotating?
A.   counter-clock-wise
B.   there's no way of telling from this information.
C.   right to left
D.   clock-wise
Question #2
By observing the _________________ of a star or planet, we can determine what kind of atoms or molecules are present and the relative abundance.
A.   absorbtion lines
B.   spectrum
C.   emission lines
Question #3
If the spectrum of Star Anita peaks at optical wavelengths, and Star Jose's surface is twice as hot as Anita's surface, then Jose's spectrum peaks in the infrared.
A.   TRUE
B.   FALSE
Question #4
In a vacuum, photons of higher energy:
A.   have higher frequencies and shorter wavelengths than lower-energy photons.
B.   have more mass than lower-energy photons.
C.   travel less distance between their source and the observer than lower-energy photons.
D.   move faster than lower-energy photons.
E.   are not as likely to become redshifted as lower-energy photons.
Question #5
Per photon, ultraviolet photons have more energy than gamma-ray photons.
A.   FALSE
B.   TRUE
Question #6
The type of spectral feature, usually observed from a hot gas without a star behind it, is an absorption line.
A.   TRUE
B.   FALSE
Question #7
When we see other people, our eyes are detecting the visible light that each of us radiates as an approximate "blackbody" (thermal emitter).
A.   FALSE
B.   TRUE
Question #8
Which one of the following statements about electromagnetic waves is false?
A.   If electromagnetic wave Simone has twice the wavelength of electromagnetic wave Ramon, then Simone also has twice the frequency of Ramon.
B.   An electromagnetic wave consists of oscillating electric and magnetic fields that are perpendicular to each other and perpendicular to the direction of motion.
C.   White light, such as sunlight, actually consists of many electromagnetic waves, having different wavelengths, mixed together.
D.   The measured speed of an electromagnetic wave is independent of the speed of its source relative to the observer.
E.   Human eyes are able to detect only a tiny fraction of all possible magnetic waves.
Question #9
Which one the the following statements about atoms is false?
A.   Electrons have discrete energy levels.
B.   An electron in an atom may absorb either part or all of the energy of a photon.
C.   Photon emission occurs randomly, in any direction.
D.   Absorption occurs when an electron in an atom jumps from a lower energy level to a higher energy level.
E.   Each element produces a unique pattern of spectral lines, like a fingerprint.

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