Astro 1 Final Exam

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Astro 1 Final Exam If a planet is seeing its moon in the new phase right now, in what phase would the planet appear to be when viewed from its moon? - ✔✔full planet What is the reason for the s... easons on earth - ✔✔earth is tilted with respect to the sun by about 23.5 degrees As compared to a cool star a hotter star emits - ✔✔shorter wavelength, higher frequency, bluer color at approximately what time does the third quarter moon rise - ✔✔midnight the electrons in a cloud of hydrogen gas are making the transition from excited states to the ground state. What does the spectrum of this cloud of gas look like? - ✔✔it will consist of a few bright emission lines at a very specific wavelengths If earth had its orbit changed so that at all the point along its orbit it was always the same distance from the sun (circular) how would this effect the seasons on earth? - ✔✔the same as they are now I detect a star giving off more ultraviolet light than green light. What property of the star can I estimate with this info - ✔✔its temperature What do you expect the spectrum of an object that is 1,000,000 kelvin to be like - ✔✔it should peak at x ray wavelengths what time of year is it dark all day (and night) at the South pole - ✔✔june A planet with its rotation axis tilted by 40 degrees relative to its orbital plane around its star would - ✔✔have dark all the time on the south pole during its winter The planets are seen in the Zodiac constellations because - ✔✔the orbit the sun in the same plane as the earth does What makes a transition from higher energy state to lower energy state when a photon is emitted by an atom? - ✔✔electron 13. Which of the following is FALSE? a) Light, radio, ultraviolet, and gamma rays are all forms of electromagnetic radiation. b) Emission spectra are characterized by narrow, bright lines of different colors. c) An absorption spectrum appears as a continuous spectrum interrupted by a series of dark lines. d) The energy of a photon is inversely proportional to the wavelength of the radiation. e) The wavelengths of the emission lines produced by an element are different from the wavelengths of an absorption line produced by the same element. - ✔✔The wavelengths of the emission lines produced by an element are different from the wavelengths of an absorption line produced by the same element One of the lines of hydrogen has a wavelength of 121.6nm. If a cloud of hydrogen gas is moving towards us at 200 km/s, what will we detect? - ✔✔An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm Why does light come in different colors - ✔✔differences in wavelength Say you are in the bottom of Happy Valley. How does the force of gravity compare to what it would be on top of Mount Nittany? - ✔✔slightly greater in happy valley than on mount nittany what kind of telescope would have to be put in space to be effective - ✔✔xray dark lines in an absorption spectrum represent - ✔✔particular energies of light coming from a distant object that are absorbed by material in between if the mass of the sun were cut in half, how would the force between the sun and earth change? - ✔✔it would decrease by a factor of two In what way does a 30 meter telescope outperform a 10 meter telescope - ✔✔the images of a 30 meter are 9 times brighter than a 10 meter On a planet whose moon is the same orbital plane as the planets orbit around its star, how often will solar eclipses occur - ✔✔once every orbit of its moon (its month) say that our moon was full on May 1st 2007. When was the next first quarter phase after that full moon? - ✔✔may 22 (3 weeks later) Why does a neon light appear red? - ✔✔it gives off an emission spectrum with mostly red spectral lines Why dont we see the constellation Orion all year? - ✔✔As the Earth orbits the Sun, its nighttime side points to different constellations at different points along its orbit From earth, in which type of constellation might you find the planet Saturn? - ✔✔only in a Zodiac constellation What is the main constituent of the atmosphere of Venus? - ✔✔carbon dioxide The escape velocity needed for an atom in the atmosphere of a planet to escape the gravitational pull of the planet is smaller if: - ✔✔the mass of the planet is smaller The planets in the solar system were formed - ✔✔as individual condensation/accretion centers in a rotating solar nebula Which of the following is true about Neptune? a) Its atmospheric composition and rings are most like Saturn's. b) Its atmospheric composition is most like Saturn's, but its rings are more like those of Uranus and Jupiter. c) Its atmospheric composition is most like Uranus and its rings are like those of Uranus and Jupiter. d) Its atmospheric composition and its rings are most like Jupiter's. e) It is more like the Earth than it is like any of the other giant planets - ✔✔Its atmospheric composition is most like Uranus and its rings are like those of Uranus and Jupiter The oort cloud is thought to be: - ✔✔a spherical cloud of comets surrounding the solar system Venus is visible to us: - ✔✔only near sunrise or sunset Planet A has an orbit with a semi-major axis of 3 AU. Planet B has an orbit with a semi-major axis of 12 AU. How does the orbital period compare between the two planets? Use p^2=a^3 - ✔✔Planet B has an orbital period 8 times longer than Planet A. 12/3=4. 4^3=64 sqrt(64)=8 How would an inflated landing module bounce if it were dropped onto the surface of earth from the same altitude as it was on Mars? - ✔✔it would bounce lower and fewer times on earth than it did on the surface of mars How does Pluto's mass compare with that [Show More]

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