Exam #1 Flashcards
How many forces does it take to keep a body in orbit?
1
What is correct about Pluto?
It is now considered to be a dwarf planet
It is found in the Kuiper belt
If someone were to ask “how many galaxies are in the universe?” the most correct answer should be:
1
If the Milky Way galaxy or shrunk down to the size of the United States, on the scale, the solar system would be the approximate size of ________.
A dime
What type of EMR has the third lowest frequency?
Infrared
What type of EMR penetrates the skin but get of sort by the bone?
X-rays
What type of EMR has a slightly shorter wavelength and Violet visible light?
Ultraviolet
What type of EMR has the second highest energy?
X-rays
What type of spectrum would you get from the florescence lights (hot, thin gas) in this room?
Bright line (emission)
What type of spectrum would you get from molten lava (hot dense melted rock) in Hawaii?
Continuous
What type of spectrum is a rainbow in the sky after a storm?
Dark line (absorption)
What color of visible light has the third longest wavelength?
Yellow
Which phenomenon listed is an example of diffraction?
Being in the bay near McCovey Cove in SF and having a wave pass you that entered the bay under the Golden gate Bridge
Which phenomenon listed is an example of refraction?
- A rainbow in the sky after a storm
- A spoon seeming to be broken or bent when sticking out of a glass of water
- seeing a “halo” around the sun
By observing the wavelengths of the missing lines (dark lines) in an absorption (dark line) spectrum what can you determine about the source producing those dark lines?
It’s composition
Assume that you use a prism to disperse the light from a certain source and observe a spectrum that has all visible colors with no breaks in between. From this observation, you can correctly conclude that:
- That the source of light is admitting white light
* That the source of light is a dense solid liquid or gas
Which of the following is not a unit of distance?
Megahertz
If you are in a room that only has one wavelength of green light illuminating it and then looked at your DVDs surface what color(s) would you see coming from the DVD?
Just green
Why does the Milky Way galaxy look like a band of the light when we view it in the night sky?
Because our galaxy is relatively flat and we are seeing distant stars along it’s plain
When thinking of the earth out word which of these gives you correct relative order of distance from Earth?
Kuiper belt, Oort cloud, Andromeda galaxy, quasar three CE 273
According to the Potatochip rule which should be the most common of the five listed above in the universe?
Dwarf planets
According to the potato trip rule which should be least common of the five listed above in the universe?
Clusters of galaxies
The philosophical concept that states that a simple hypothesis is more likely to be correct that a complex one is known as:
Occam’s Razor
The fifth major planet from the sun is:
Jupiter
The Greek scientist Eratosthenes determine the ________ using shadows.
Circumference of earth
The individual stars you observant night from Santa Rosa with your naked eye……..
Are all further from us then the Alpha Centuri start system it is
The first astronaut to walk on the moon was?
Neil Armstrong
On average it takes light about eight minutes to travel to earth from Venus. What else can we conclude from this information?
- Venus is about eight light minutes away
- if Venus blows up, we would have to wait about eight minutes to see the explosion
- When we see Venus through a telescope, we are seeing it the way it looked eight minutes ago.
How many stars are in the solar system?
1
The speed of light is about?
300,000 km/sec
How far will light travel in one day?
1 light day
How many light minutes are in 1 light hour
60
If the Death Star were to blow up Mars (12 light minutes away) at this instant in time, how long would we have to wait, on earth, to see the explosion?
12 minutes
What 2 regions of the solar system are thought to be the origin of comets?
- Kuiper belt
* Oort Cloud
In 1954 in Alabama, Ermaline Hewlett Hodges was struck by _________.
A meteorite
If you were going to design a pair of glasses for humans to see mice running around at night you might want them to convert……
Infrared to visible light
If you find out that a galaxy was just discovered and astronomers are calling it be Orion dwarf galaxy, what other conclusion can you correctly make about this galaxy?
It is found in the same direction but further than the stars with in the constellation of Orion
What is correct about the Canis Major dwarf galaxy?
It is now thought to be the closest galaxy to the Milky Way galaxy
If you and your friend were separated by a distance of “1 astronomical unit”, what else can you say about this distance?
It is equivalent to 93 million miles
It is the average Earth-Sun distance
How many galaxies are in the solar system?
Billions
