Flashcards
Astro 2 Exam
Flashcards do conjunto (52)
- 1Match each lettered blob with which planets would fall in that region. Each option is used onceA- Terrestrial Planets
B- Gas Giants
C- Jovian Planets
D- Ice giants - 2Match each planet with the letter that best represents its atmospheric pressure and average surface temperature on the graph below. (Hint: Earth,Venus, Mercury, Jovian Planets, MarsA- Typical Jovian Planet
B- Venus
C-Mars
D- Mercury
E- Earth
- 3What is found in both the Asteroid Belt and Kuiper Belt-composed of very many small rocky bodies, typically much smaller than planets
-constituent objects are each orbiting the Sun
-mostly empty space - 4What determines the color of light?Wavelength, Frequency, and Energy
- 5Consider the following discussion between two students about the different properties of light. Student 1: I think I get how light works. If you look at the chart of the EM spectrum, it shows that light with a higher frequency will also have a long wavelength. But it all has the same speed. Student 2: I disagree. If one type of light has a lot of energy and a high frequency it will have a faster speed than light that has a lower energy and a low frequency. Which student(s) is/are correct, if either?Neither, both students are wrong
- 6For each pair of variables below, indicate whether they are directly proportional or inversely proportional. wavelength and frequency energy and wavelength energy and frequencywavelength and frequency: Inverse
energy and wavelength: Inverse
energy and frequency: Direct - 7Let's say your favorite radio station is "at 99.9 on the FM dial", which means it is broadcast using electromagnetic waves with a FREQUENCY of 99.9 MHz ("mega"hertz, or million hertz). What wavelength do these waves have? Do a calculation. The value for the speed of light is provided on the equation lists near the beginning of your workbook.About 3 meters
- 8The number line above has increasing values going to the right. Which physical quantities could this number line represent?Frequency and energy
- 9Imagine you are an astronomer studying the Sun, and you are looking at the Sun through a telescope -- with a strong filter to protect your eyes of course. While you are gazing at the Sun, you see a "flare" on the surface of the Sun -- a small but violent eruption that emits a lot of light at all wavelengths, from radio waves to gamma rays. How long after you see the flare until the Earth is bathed in the dangerous x-rays and gamma rays from this flare?No time at all. Earth is already getting hit by the x-rays and gamma rays.
- 10Characteristics of comets (3)-looks bright because of reflected sunlight
-can be visible in the sky for many weeks
-typically several AU away from Earth when you see it - 11Characteristics of meteors (1)only visible when passing through Earth's atmosphere
- 12What do comets and meteors share in common? (1)-looks like a streak of light in a photograph of the sky
- 13Student 1: If the distance to the star is more than 1 parsec, then the parallax angle must be more than 1 arcsecond. So a star that is many parsecs away will have a large parallax angle. Student 2: If we drew a diagram for a st ar that was much more than 1 parsec away from us, the triangle in the diagram would be pointier than the one we just drew in Part II. That should make the parallax angle smaller for a star farther away.student 2 is correct because they describe an inverse proportionality relationship between parallax angle and distance: as one quantity gets larger, the other gets smaller, and vice versa
- 14Star Alpha is half as far away as Star Beta. Therefore Star Alpha's parallax angle will be2 times as large as Star Beta's.
- 15How far away is a star with parallax angle = 0.04 arcseconds?25 parsecs
- 16A star is 4 parsecs away. What is its parallax angle?0.25 arcseconds
- 17The photos are laid atop one another so the background stars (circles) line up. Two nearby stars are in different positions six months apart, so they each appear twice. Which of these nearby stars is closer to us?the star with a five-point symbol
- 18To measure a star's parallax angle accurately, you should observe a star's location against the background starson many nights over the course of a year
- 19For five of the stars (A, B, C, F, & G) on the H-R diagram below, identify the correct combination of whether it is intrinsically relatively "dim" (low luminosity) or "bright" (high luminosity), and relatively "cool" (below 5,000K) or "hot" (above 10,000K).star A: bright and hot
star B: bright and hot
star C: dim and hot
star F: dim and cool
star G: bright and cool
- 20Identify which ones are Main Sequence stars. Which one will have the longest total lifetime?-A,B,E,F
-F - 21If Star Omega and Star Omicron have the same surface temperature and are the same size (radius), which star, if either, is more luminous?the stars have the same luminosity
- 22Which is the LARGEST radius star on the diagram above? Which star has the SMALLEST radius on the diagram above?X
V
- 23Indicate the position of a star that would be smaller in radius (i.e. size) than Star W but with the same temperature.D
- 24You observe two stars with the same luminosity and determine that one has larger radius than the other. Which star is hotter?the smaller star
- 25Match each of the above three pictures of spectra with which basic type of spectrum it is.1. Continuous
2. Emission
3. Absorption
- 26Match the graph of spectra with which basic type of spectrum it is.Absorption
- 27Match the graph of spectra with which basic type of spectrum it is.Emission
- 28Match the graph of spectra with which basic type of spectrum it is.Continous
- 29Absorption line and emission line spectra of light can directly tell us the __?__ of astronomical objects.Composition
- 30Continuous spectra of light can directly tell us the __?__ of astronomical objects.Temperature
- 31The hottest Main Sequence stars are about 40,000 K. At what wavelength do they emit the most radiation7.2 x 10-8 m
- 32What color would the hottest Main Sequence stars look to your eye?Blue
- 33You notice with amusement that your roommate accidentally puts on one blue sock and one red sock. How does the temperature of the two socks compare? (Note: Could you explain why?)Both socks are about the same temperature.
- 34Your roommate notices you laughing and changes into two white socks to escape your ridicule, and goes outside into the sunshine. You follow behind and measure a portion of the continuous spectrum of light from the socks, finding it to peak at 500 nanometers (nm). ("nano" = 10-9). What is the temperature associated with a thermal spectrum that peaks at 500 nm? (Side Note: Could you explain why?)5.8 x 103 K
- 35The graph above shows thermal spectra for stars with different surface temperatures, and all approximately the same size. Which of the stars has the lowest temperature?D
- 36The graph above shows thermal spectra for stars with different surface temperatures, and all different sizes. Which of the stars has the lowest temperature?D
- 37Which star has a lower temperature?They have the same temperature
- 38Last week's homework asked you: "You notice with amusement that your roommate accidentally puts on one blue sock and one red sock. How does the temperature of the two socks compare?" The correct answer was "Both socks are about the same temperature." Indeed, both the socks are at roughly human body temperature, since they are in direct contact with the skin. Why is it that a blue STAR is significantly hotter than a red STAR, but a blue SOCK is not significantly hotter than a red SOCK? Choose THREE statements below that are true.-Dyes in socks selectively reflect and absorb different colors of ambient visible light, determining which colors your eyes see.
-The light you see from stars is their thermal (blackbody) spectrum, so it is determined by their temperature.
-The light you see from socks is reflected light from another light source, so it has nothing to do with the socks' temperature. - 39Last week's homework asked you: "Your roommate notices you laughing and changes into two white socks to escape your ridicule, and goes outside into the sunshine. You follow behind and measure a portion of the continuous spectrum of light from the socks, finding it to peak at 500 nanometers (nm). ("nano" = 10-9). What is the temperature associated with a thermal spectrum that peaks at 500 nm?" The correct answer was 5.8 x 103 K, or 5800 K. What object(s) actually has a temperature of 5800 K, and produces the thermal spectrum of light that you measured in this problem?The sun
- 40Consider the following statement made by a student regarding a star's temperature and its corresponding absorption line spectrum. Student: If I am looking at a star's absorption line spectrum and see that it has a lot of lines at the blue end of the spectrum, then the star must be hot because the blue lines are higher energy lines. Do you agree or disagree with the student, and why?Disagree because the color of absorption and emission lines has nothing to do with temperature.
- 41The figure above shows the spectra of five objects, all showing the same set of spectral lines from hydrogen. This pattern of lines is the spectral "fingerprint" of hydrogen. Thus the objects must all contain hydrogen. The wavelengths that the spectral lines should be for hydrogen are very precisely known. The top spectrum shows the spectral lines of hydrogen measured in the laboratory at rest (no Doppler shift), so they precisely match the expected wavelengths for hydrogen. However, the other four spectra show the lines to be shifted to different wavelengths. These are Doppler shifts. Indicate whether each object is moving toward you, away from you, or not moving.Object 1: moving away
Object 2: moving away
Object 3: moving toward
Object 4: moving toward
- 42Match the following planets with the doppler shift that they will detect in the signalPlanet A: Redshifted
Planet B: Blueshifted
Planet C: Unshifted
Planet D: Unshifted
Planet E: Blueshifted
- 43the student debate about gravity. Which student is wrong, and WHY?Student 2 is wrong because they said Earth exerts the stronger force.
- 44Your "weight" on Earth is a measure of the gravitational force between you and the Earth. What would your "weight" be on Mars? Mars has half the radius of Earth, and one-tenth the mass of Earth. Therefore your weight on Mars would be2/5 of your weight on Earth.
- 45Astronauts inside the space station are weightless becauseThey are in freefall
- 46If the astronaut above could somehow magically have their current motion suddenly and completely stopped, and was then released, what would happen next?Yes, they would plunge straight down to their death. :(
- 47Out of the electromagnets, which has the shortest wavelength?Gamma rays
- 48What is the order of the planetsMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto
- 49Terrestrial Planets (VEMM)Earth,mercury,venus,mars
- 50Jovian Planets (JUNS)Saturn, Jupiter, Uranus, Neptune
- 51Regarding parces (inverse/direct), which stars are closest to us? farthest?Closet: Star with the highest mass
Farthest: Smallest mass - 52—
Informações
- Descrição
- Astronomy FlashCards sobre Astro 2 Exam, criado por Kyla Davis em 22-10-2021.
- Criado por
- Kyla Davis
- Visualizações
- 0
- Avaliação