ASTR 121 80 Exam 1 Study Guide Quiz Questions Well Answered
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Course
ASTR 121
Institution
ASTR 121
A human being is the size of what kind of light? - ️️radio
A neon light produces what kind of spectrum? - ️️emission spectrum
A new planet Vulcan is discovered that is always on the opposite side of the Sun from the Earth. Which of the following is true - ️️its orbital period is 1 yea...
ASTR 121 80 Exam 1 Study Guide Quiz
Questions Well Answered
A human being is the size of what kind of light? - ✔ ✔ radio
A neon light produces what kind of spectrum? - ✔ ✔ emission spectrum
A new planet Vulcan is discovered that is always on the opposite side of the Sun from the Earth. Which
of the following is true - ✔ ✔ its orbital period is 1 year
it never transits the sun
A planet has an angular size of 20 degrees. If the planet moves twice the distance away, its angular size
will be - ✔ ✔ 10 degrees
A rocket on a Hohmann orbit from Earth to Venus will take: - ✔ ✔ 5 months
A star goes from 3,000K to 9,000K. How much more energy does it emit? - ✔ ✔ 81 times more
A star has a declination of 60N degrees, how many degrees is it from the north celestial pole? - ✔ ✔
30
According to Galileo, a ball rolling on a flat desert would roll forever. But we know that a ball rolling on
the ground eventually comes to a stop due to friction. Where does all the energy of motion go? - ✔ ✔
it is turned into heat
According to Kepler's 2nd law, a satellite in a highly eccentric orbit will move the fastest at - ✔ ✔
perihelion
Again, according to Kepler's 2nd law, to make your orbit smaller you need to go - ✔ ✔ faster
And if we halve the mass of the atoms, how does the temperature change? - ✔ ✔ 1/2 as much
Asteroids are thought to be a planet that did not form. If this planet had formed its orbital period would
have been - ✔ ✔ greater than Mars'
Circumpolar stars are those stars which never set below the horizon due to their close angular distance
to the north celestial pole. As you travel north, are their fewer or more circumpolar stars? - ✔ ✔
more
From air to oil, if the angle of incidence is 30 degrees, the angle of refraction is - ✔ ✔ less than 30
degrees
Gamma rays are about - ✔ ✔ 10^-10 mm
, How do we know there is not a Moon-sized, invisible object orbiting near the Earth - ✔ ✔ tides
How does the force of gravity compare for a 150 lbs astronaut on the Earth's surface to the same
astronaut in a 200 km orbit? - ✔ ✔ pretty much the same
How many Jupiter 'days' in a Jupiter 'year'? - ✔ ✔ 10,601
How many n's is 90 degrees - ✔ ✔ 1/2
How many planets were visible to Greek astronomers - ✔ ✔ 5
How many times a year, at most, will Mars display retrograde motion - ✔ ✔ once
How many Venus 'days' make up a Earth 'year'? - ✔ ✔ 1.5
How many Venus 'years' make one Earth year - ✔ ✔ 1.62
How much more energetic is a x-ray photon of wavelength 1 Angstrom to a microwave photon of
wavelength 5 cms? - ✔ ✔ 500 million times
Humans emit most of their energy in the near-IR. How much would we have to heat you up so that you
glowed blue? - ✔ ✔ 25 times as much
If a 10,000 lbs truck moving a 20 mph strikes a 2,000 lbs car at rest, and all the momentum is transferred
to the car, how fast will the car be moving afterwards? - ✔ ✔ 100 mph
If a baseball masses 10 times more than a ping-pong ball, how much more will the ping-pong ball
accelerate from the swing of the same bat? - ✔ ✔ 10 times more
If a planet is discovered around another star, and it has rings, its probably a - ✔ ✔ jovian world
If atoms are spherical with a radius of 10^-8 cm, then, roughly, how many atoms in a sphere one
centimeter in radius - ✔ ✔ 10^24 atoms
If instead of changing the velocity, we halve the mass the atoms, how much does the pressure change? -
✔ ✔ 1/2 as much
If planet A has an angular size of n/8 and planet B has an angular size of n/4, which planet is larger in
physical size? - ✔ ✔ cannot be determined from information given
If planet X had an orbital period of less than 365 days, then we know it is located - ✔ ✔ inside the
Earth's orbit
If the angle of incidence is 30 degrees, the angle of reflection is - ✔ ✔ 30 degrees
If the astronauts obeyed the 55 mi/hr speed limit on the Moon, how long was the trip from the Apollo
17 to Apollo 11 landing sites? - ✔ ✔ 6.8 hours
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