Astro 1 Final Exam | 100 Questions with 100% Correct Answers | Verified | Latest Update 20, Exams of Astronomy

Download Astro 1 Final Exam | 100 Questions with 100% Correct Answers | Verified | Latest Update 20 and more Exams Astronomy in PDF only on Docsity! Astro 1 Final Exam | 100 Questions with 100% Correct Answers | Verified | Latest Update 2024 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? - Correct answer-full planet What is the reason for the seasons on earth - Correct answer-earth is tilted with respect to the sun by about 23.5 degrees As compared to a cool star a hotter star emits - Correct answer-shorter wavelength, higher frequency, bluer color at approximately what time does the third quarter moon rise - Correct answer-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? - Correct answer-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? - Correct answer-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 - Correct answer-its temperature What do you expect the spectrum of an object that is 1,000,000 kelvin to be like - Correct answer-it should peak at x ray wavelengths what time of year is it dark all day (and night) at the South pole - Correct answer-june A planet with its rotation axis tilted by 40 degrees relative to its orbital plane around its star would - Correct answer-have dark all the time on the south pole during its winter The planets are seen in the Zodiac constellations because - Correct answer-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? - Correct answer-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. - Correct answer-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? - Correct answer-An emission line in the cloud's spectrum with a wavelength shorter than 121.6 nm Why does light come in different colors - Correct answer-differences in wavelength How was Earth's moon formed according to the currently most-accepted theory? - Correct answer-It was formed from debris produced by the collision of a Mars-sized object with the earth Why does Mars have seasons? - Correct answer-its axis is tilted relative to its orbital plane Which planet is able to retain the largest atmosphere? - Correct answer-Jupiter The process of formation of the Solar System - Correct answer-took only a small fraction of the age of the solar system Which is smallest - Correct answer-Saturns moon encledus Which of the following is typical of a terrestrial planet? - Correct answer-evidence for volcanic activity What are the most abundant gases in Jupiter's atmosphere - Correct answer-hydrogen and helium Which has the lowest average density - Correct answer-Uranus Which of these planets has rings - Correct answer-jupiter Which fact about mars is not true? a) There are giant volcanoes on Mars, larger than any on Earth. b) There was once water on the surface of Mars. c) The Viking spacecraft landed on Mars in 1976. d) It is always colder than freezing on Mars surface. e) Mars has a thicker atmosphere than Earth does. - Correct answer-Mars has a thicker atmosphere than earth does Mars has a mass that is 1/10th the mass of earth and a radius that is 1/2 the radius of earth. compare the force of gravity on mars surface than on the surface of earth. use the proportional relationship F is proportional to m/r2 - Correct answer-gravity on mars is 4/10ths as strong as on earth The sun is at one focus of the elliptical orbit of the Earth around the sun. What is the other focus? - Correct answer-nothing Which of the following are jovian planets? - Correct answer-Jupiter Saturn Uranus Neptune Which of the following statements is true? a) Jupiter's solid surface lies just below the cloud layers visible from Earth. b) The Great Red Spot is a dust storm near the South polar cap of Mars. c) There is no evidence to suggest that either Jupiter or Saturn has a rocky core. d) Neither Uranus or Neptune have ring systems. e) The planet Uranus is blue-green and virtually featureless. - Correct answer-the planet Uranus is blue- green and virtually featureless The surface of Venus is hotter than the surface of Mercury because - Correct answer-Venus is more massive and is able to retain a thick atmosphere What fraction of the solar system's mass is in the Sun? - Correct answer-about 99% How do astonomers measure the temperature of stars? - Correct answer-by looking at which absorption lines are present in the star's spectrum How do we determine the age of a star cluster? - Correct answer-by identifying the type of stars that have just turned off the main sequemce A hypothetical star has a parallax of .05 arcseconds. How far away is it - Correct answer-20 parsecs A 10 solar mass star - Correct answer-will eventually develop an Iron core A star that is twice the mass of our sun would have a habitable zone that - Correct answer-Includes mars but not earth The largest fraction of nearby stars are - Correct answer-red dwarfs What happens when a planet passes in front of its star (between the star and us) - Correct answer-the star decreases in brightness and the star moves towards us A 16 solar mass main sequence star is at a smaller distance than a 1 solar mass main sequence star. Which star appears brighter? - Correct answer-16 solar mass sequence star The event horizon of black hole is - Correct answer-the minimum distance from which light can escape A cold, irregularly shaped region in the interstellar medium that diminishes or completely obscures the light from background stars is called an: - Correct answer-dark dust cloud In nuclear fusion, energy is produced because: - Correct answer-the mass of the reacting chemicals is larger than that of the products Is the milky way galaxy currently participating in galactic cannibalism, and if so what is it devouring? - Correct answer-it is currently pulling apart and "eating" the Sagittarius Dwarf Galaxy Fill in the blank in the following chemical reaction that occurs in the Sun: Deuterium + proton = ?? and +energy - Correct answer-helium 3 What happens when you drop a clock into a black hole? - Correct answer-The clock appears to be advancing slowly from the point of view of an outside observer, but normally for an observer falling with the clock. In which part of the sun are gamma rays produced? - Correct answer-core Why cant we see back the whole way to the Big Bang? - Correct answer-The radiation scatters off matter frequently so the Universe is opaque. Which is smallest? - Correct answer-Solar system Which of the following is TRUE? a) Irregular galaxies rarely have star formation taking place in them. b) Galaxy collisions destroy most of the stars in the galaxies involved. c) Most elliptical galaxies contain only young stars. d) Most galaxies appear to be approaching the Milky Way Galaxy. e) There is a supermassive black hole in the center of the Milky Way Galaxy - Correct answer-There is a supermassive black hole in the center of the milky way galaxy What type of boson is responsible for the electromagnetic force? - Correct answer-photon An up quark has charge +2/3, a down quark has charge -1/3, and a strange quark has charge -1/3. The Sigma0 particle is formed by a combination of two down quarks and one strange quark. What is its charge? - Correct answer--1 Which of the following is true? a) It is possible for galaxies that are very distant to actually move through space at a speed several times the speed of light. b) A redshift occurs when a photon loses energy and slows down as it moves through space. c) We see distant galaxies as they were billions or even tens of billions of years ago. d) We measure a redshift for roughly half of the galaxies that we observe, and for the others we measure a blueshift. e) The center of the universe is located at a point about 200 Mpc from us in the center of a cluster of galaxies. - Correct answer-We see distant galaxies as they were billions or even tens of billions of years ago. Among these choices which is the first to happen in the history of the universe? - Correct answer- formation of nuclei of helium 88. Which of the following statements is definitely FALSE? a) String theory suggests that extra dimensions may exist beyond our three known spatial dimensions and time. b) There is an absence of space beyond the boundaries of our observable universe. c) There is a theory of quantum mechanics in which new universes split from ours at every random event. d) New universes may break off from ours as it expands. e) Universes with the largest number of black holes are favored in the theory of natural selection of universes. - Correct answer-There is an absence of space beyond the boundaries of our observable universe. What do quasars look like - Correct answer-individual stars in the milky way Does the existence of quasars imply that radiation can escape a black hole? - Correct answer-No, the emission of radiation occurs before material falls in through the event horizon. Which of the following makes a meson? - Correct answer-an up quark and an anti-down quark What property of dark matter leads to it keeping galaxy clusters tofether? - Correct answer-It produces gravity due to its mass. What did the Wilkinson Microwave Anisotropy Probe (WMAP) measure? - Correct answer-differences in the temp of radiation coming from the big band from different directions What fraction of the energy density of the universe consists of dark matter? - Correct answer-21% Compared to spiral galaxies, elliptical galaxies have.. - Correct answer-less gas, less dust, and less new star formation. What happens to the planets when the galaxy collides with another galaxy? - Correct answer-Nothing, because the spaces between stellar systems in a galaxy is much larger than their size. If extra dimensions do exist, why wouldn't we see obvious evidence for them in everyday life? - Correct answer-They would be quite small and hard to detect. How do astronomers measure the mass of a supermassive black hole? - Correct answer-by measuring the speed at which stars move in its vicinity What produces the afterglow of a gamma-ray burst? - Correct answer-Collision of expanding stellar material with gas and dust in the interstellar medium.