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Astronomy Final

Terms in this set (201)

Why is Newton's version of Kepler's third law so useful to astronomers?
It can be used to determine the masses of many distant objects
How many arcminutes are in 1 degree?
60
What would happen if a rocket were launched with a speed greater than Earth's escape velocity?
It would travel away from earth into the solar system
The reason galaxies that are distant from our galaxy move away from our galaxy more rapidly than those that are near is
more space expands between us and the distant galaxies
How many arcseconds are in one arcminute?
60
Gravity is an inverse square law in distance. Therefore, if the distance between two masses is decreased by a factor of 4, the gravitational force between those two masses
increases by a factor of 16
Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?
its wavelength and energy
Cell phone signals passing through walls is an example of
transmission
When an electron drops to a lower energy level in an atom,
light at a wavelength specific to the change in energy levels is emitted
Sunlight takes 8.4 minutes to get from the Sun to Earth. When NASA's New Horizons Spacecraft passed Pluto in 2016, it was 33 AU from Earth. How long did it take for its transmitted images of Pluto to arrive at Earth?
4.6 hours
Red light has a lower energy per photon than blue light. Therefore, red light has
lower frequency, longer wavelength than blue light
According to the universal law of gravitation, the force due to gravity is
inversely proportional to the square of the distance between objects
From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation?
gamma rays, x-rays, ultraviolet, visible light, infrared, radio (GXUVIR)
What is the ecliptic?
the path the sun appears to trace around the celestial sphere each year
Which is hotter?
a blue star
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