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ASTRO100H - EXAM2 2024 WITH 100% ACCURATE SOLUTIONS
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ASTRO100H - EXAM2 2024 WITH 100%ACCURATE SOLUTIONS
QUIZ8-Q1: Which of the following is not an advantage that a reflector
telescope has over a refractor telescope?
a. reflectors avoid the problem of chromatic aberration in the lens
b. flaws and bubbles in the material inside a thick mirror are not a
problem, while flaws and bubbles in the material inside a thick lens are
c. the device that collects the light is more easily supported in a reflector
d. reflectors can be built with much bigger apertures
e. a reflector doesn't have to deal with the twinkling of the stars, as a
refractor does - Precise Answer ✔✔e. a reflector doesn't have to deal
with the twinkling of the stars, as a refractor does
QUIZ8-Q2: A graduate student is trying to follow the weather on Jupiter
for their PhD thesis. To see the big weather patterns in the upper
atmosphere of the planet, they need to have excellent resolution. What
type of telescope would be best for them to use?
a. a refractor, with as small an aperture as possible
b. a radio telescope
c. you can't fool me, all these telescopes have the same resolution
d. a large reflector located in orbit above the Earth's atmosphere
e. a large reflector in an observatory located at sea level - Precise
Answer ✔✔d. a large reflector located in orbit above the Earth's
atmosphere
,QUIZ8-Q3: An astronomer who is observing visible light from a
glowing cloud of gas in space uses an instrument which contains a
grating with thousands of grooves on its surface. What will this
instrument allow our astronomer to do?
a. concentrate more light into a focus point
b. turn a reflector into a refractor
c. take photos with much higher resolution
d. observe radio waves from the cloud at the same time as visible light
e. spread out the light from the cloud into a spectrum - Precise Answer
✔✔e. spread out the light from the cloud into a spectrum
QUIZ8-Q4: Radio telescopes of modest size can't make out as much
detail (have a lower resolution) than visible light telescopes. How do
astronomers overcome this limitation?
a. the same engineers responsible for the shape of the mirror for the
Hubble Space Telescope are working on this problem; stay tuned
b. we have launched a small radio telescope satellite into orbit, which
(being above the atmosphere) can make out much more detail than any
visible light telescope
c. they have built a radio telescope in the desert that completely covers
1000 square miles
d. we can connect several radio telescopes some distance apart together
electronically to give us the resolution of a larger telescope
e. this problem can't be solved; radio telescopes will always show poor
detail - Precise Answer ✔✔d. we can connect several radio telescopes
,some distance apart together electronically to give us the resolution of a
larger telescope
QUIZ8-Q5: Which of the following is not an advantage that the Hubble
Space Telescope has over large telescopes on Earth?
a. the Hubble has a better resolution than visible-light telescopes on
Earth (not counting adaptive optics)
b. you can't fool me, all of these are advantages the Hubble has over
earth-bound telescopes
c. the Hubble can observe at wavelengths (such as UV) which cannot be
seen from the ground
d. the Hubble has a larger aperture than any visible-light telescope on
Earth
e. the Hubble is above the Earth's atmosphere, while on the ground star
images twinkle and jiggle - Precise Answer ✔✔d. the Hubble has a
larger aperture than any visible-light telescope on Eart
QUIZ10-Q1: According to the formula E=mc2,
a. a little bit of energy can be converted into a substantial amount of
mass
b. when two masses collide, we always get a lot of light
c. mass has to travel at the speed of light before it can produce any
energy
d. a little bit of mass can be converted into a substantial amount of
energy
, e. energy can travel much faster than light (in fact its speed can be the
speed of light squared) - Precise Answer ✔✔d. a little bit of mass can be
converted into a substantial amount of energy
QUIZ10-Q2: If the "fuel" for nuclear fusion is nuclei of hydrogen, and
the Earth's oceans are filled with hydrogen atoms in water all being
jostled together, why isn't there a lot of fusion happening in our oceans?
a. on Earth, only hydrogen that is in deep mines under the Earth is far
enough underground for fusion
b. the hydrogen in our oceans is the wrong type of hydrogen for fusion
c. you can't fool me, hydrogen in the Earth's oceans does undergo fusion;
that's what keeps our oceans warm
d. for hydrogen nuclei to fuse, they must get very close to each other,
which the nuclei in the oceans cannot do
e. for hydrogen to fuse, the nuclei must first join together in long chains
of atom - Precise Answer ✔✔d. for hydrogen nuclei to fuse, they must
get very close to each other, which the nuclei in the oceans cannot do
QUIZ10-Q3: Who pays the bill for the energy generated by nuclear
fusion in the Sun? In other words, where does the energy pouring out of
the Sun come from ultimately?
a. American taxpayers pay this bill, as they do so many others!
b. the Sun is spinning more slowly as time goes on; rotation energy is
lost
c. heavy nuclei are breaking apart into lighter nuclei
d. material (like meteorites) is falling into the Sun and being vaporized
to produce energy
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