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Astro Quiz 5
huge hw
46
Astronomy
Undergraduate 1
12/05/2009

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Term
where on E do you see the most circumpolar stars?
Definition
N and S poles
Term
where will stars appear to rise perpendicular to the horizon?
Definition
equator
Term
place on ecliptic where sun stops its Nward motion in sky
Definition
summer solstice
Term
ecliptic defed by
Definition
Es plane of orbit
Term
vernal and autumnal equinoxes=
Definition
cel locations where cel equator and ecliptic coincide
Term
angle bw ecliptic and cel equator=
Definition
23.5 deg
Term
seasons caused by
Definition
tilt of Es Es axis rel to ecliptic
Term
where on E can you obs all stars in sky over whole yr
Definition
equator
Term
why does stlr parallax exist?
Definition
bc E moves in spc
Term
keplers first law states t pltary orbits are
Definition
ellipses w sun at one focus
Term
keplers 2nd law states t the ln t cnns plt to sun
Definition
sweeps out = areas in = times
Term
k's 3rd law of pltary motino states t
Definition
sq of pd of plts orbit in yrs = cube of semi-major axis of its orbit in au
Term
newtons 2nd law of motion states t
Definition
body acted on by force will accelerate constantly while force is applied
Term
(2)we can find the mass of the sun if we know...
Definition
the d a plt is f the sun and the time it takes to make a full orbit
Term
(2)Gal force bw 2 objs deps on
Definition
d bw 2 objs and their masses
Term
obj moving toward you shows
Definition
blue shift
Term
wh vis lt has highest e?
Definition
violet
Term
E=
Definition
hc/w
Term
(2)doppler effect can det:
Definition
radial v of star and spd at wh star is moving away f an obser
Term
(2)compared to vis waves, radio waves have
Definition
lower e, longer w
Term
(2)compared to vis waves x-ray waves have:
Definition
higher e, shorter w
Term
we see diff phases of moon por
Definition
its motion in its orbit runt E
Term
how does moon rot to keep one face pted toward E at all times?
Definition
it completes one full rotn (360deg) once per month
Term
day f sunrise to sunrise on moon = hm E days?
Definition
29.5
Term
why is moons synodic month not = to sidereal month?
Definition
bc E-moon sys is also orbiting sun
Term
eclipse of sun occurs only at
Definition
new moon
Term
eclipse of moon occurs only at
Definition
full moon
Term
rson why we see annular eclipses of sun
Definition
moons orbit ar E isnt perfectly circ
Term
why isnt it poss to see annular lunar eclipse?
Definition
E is m lger th moon
Term
(3)moon moves acr sky in...
Definition
plane t is neither ecliptic nor cel =tor nor parallel to hor
Term
why does moon show reddish color during total lunar eclipse?
Definition
only red part os sol sp is deflected onto it by Es atm
Term
person standing on moon penumbra will see
Definition
partial sol eclipse
Term
(2)highest tides occur
Definition
at new or full moon, when moon and sun are closest to E
Term
(2)why does moon rot ar E synchronously (always keeping one sd pted towards it)?
Definition
por Es Gal pull, wh causes tidal friction on moon
Term
length of day on E was...
Definition
shorter in past bc E spun faster
Term
(2)incing D of tel
Definition
incs lt-gathering pwr and reolving pwr
Term
angular res of tels inced by
Definition
lger tels
Term
angular res worsens as
Definition
w incs
Term
spectrograph used to m
Definition
distribution of lt intensity among various colors
Term
why are ccds useful?
Definition
all of the above
Term
(2)whether plt retains atm deps on
Definition
temp of atmic gas and plts mass
Term
(4)why does sun appear red at sunset?
Definition
its close to hor and lt must pass thru longer path in atm, and more blue lt is scattered out of this dir, leaving only red lt
Term
how is mass of plt deted?
Definition
obs of its Gal infl on an orbiting moon
Term
why does nr fusion req high temps?
Definition
all of the above
Term
temp of suns corona
Definition
very hot, ab 10^6 K
Term
(2)suns rotn is
Definition
diff.al, meaning =tor rotates faster th poles
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