Astronomy Multiple Choice Questions and Answers: LSU ASTR 1102 Final Exam Review, Exams of Engineering

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LSU ASTR 1102

Emmanouil Chatzopoulos

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What are the possible ways to produce a Type la supernova explosion? Hint: There may be more than 1 correct answer A. Via the explosion of a white dwarf that exceeds the Chandrasekhar mass limit after accreting material from a companion star B. Via the coalescence and collision of two white dwards in a binary system C. Via the iron core-collapse of a massive star D. Due to the collision of two neutron stars in a binary system Atomic nuclei are made of the following particles: A. Just neutrons B. Just protons C. Neutons and protons D. Electrons C. Neutrons and protons We have an expert-written solution to this problem! Which color of light has the highest frequency? A. Green B. Yellow C. Blue D. Orange C. Blue

C. Cygnus D. Canis Major(the big dog) Ursa Major(the Big Dipper) The bright star is what star? Sirius An experiment indicates that a few aspects of the theory concerning the dual wave-particle nature of light are wrong. That means the entire theory about the dual nature of light is: A. False B. Challenged, but more experiments are needed to solidify new insights C. Incomplete D. Correct, it was only one contradictory result anyway Challenged, but more experiments are needed to solidify new insights Which one of the following types of radiation is entirely blocked by Earth's atmosphere A. Optical B. Radio waves C. X-rays D. Infrared radiation X-rays Photons take a long time to diffuse through the sun's radioactive zone because: A. They interact billions and billions of times with surrounding material B. Light travels at a different speed inside stars

C. The sun's radioactive zone is too hot D. They are low energy photons They interact billions and billions of times with surrounding material Granulation is the collection of features on the solar photosphere that: A. Is the source of solar wind B. Resemble filaments("spiculi") that extends outward in radius C. Correspond to the outer part of the sun's convective zone D. Are caused by "micro-bursts" on the solar surface Correspond to the outer part of the sun's convective zone The solar corona is: A. Cooler than the photosphere B. Much hotter than the photosphere C. At about the same temperature as the photosphere Much hotter than the photosphere The fact that the sun is rotating "differentially" is important in explaining A. The 11 year solar activity cycle B. The temperature of the solar corona C. The shape of the solar sunspots D. The shape of granules The 11 year solar activity cycle The statement "the hotter it is, the brighter it is" stemming from the Stefan-Boltzmann Law means that

Nuclear reactions in the core of the sun produce: A. 100 neutrinos per second B. 1 neutrino per second C. About 10^38 neutrinos per second D. 10 neutrinos per second About 10^38 neutrinos per second Which one of the following statements is correct A. The sun is fusing helium to hydrogen to produce energy B. The phenomenon of solar granulation is related to the sun's radiative zone C. The total mass of four hydrogen nuclei together is somewhat larger than that of one helium D. A source of light approaching an observer will appear red-shifted The total mass of four hydrogen nuclei together is somewhat larger than that of one helium Which of the following methods of energy transport is NOT active in the sun and most regular stars? A. Convection B. Radiation diffusion C. Heat conduction Heat conduction Which sub-field of astronomy from the list below is NOT a component of what we call "multi- wavelength astronomy" A. X-ray astronomy B. Radioastronomy C. Gamma-ray astronomy

D. Ultraviolet astronomy E. Gravitational-wave astronomy Gravitational-wave astronomy Find the correct matches: A. Stefan-Bozmann's law B. Wienn's Law C. Kirchoff's second law D. Kirchoff's third law E. Doppler's law A. "The hotter it is the brighter it is" B. "The hotter it is the bluer it is" C. Emission-line spectrum D. Absorption-line spectrum E. Receding sources appear redshifted A distant galaxy appears to moving perpendicular to your line of sight (such as the distance between you an that galaxy remains the same). The galaxy spectrum will appear to be: A. blue shifted B. Red-shifted C. Unaffected Unaffected Sort the provided types of electromagnetic radiation with respect to wavelength starting from the one with the longest wavelength and ending to the one with the shortest wavelength Radio waves

C. Star A is truly (intrinsically) brighter than Star B D. Star B is truly (intrinsically) brighter than Star A Star B appears brighter than Star A The absolute magnitude of a Star is the "real" magnitude of the Star if measured from distance of: A. 1 pc B. 10 pc C. 100 pc D. 1000 pc 10 pc Which of the following factors DOES NOT make a nearby star appear red? A. Low temperature (because they are cool) B. Reddening due to dust C. Redshift due to Doppler effect Redshift due to Doppler effect Which of the following Stars is hotter? A. A-type star B. B-type star C. O-type star D. F-type star O-type star In the Hertzsprung-Russel(HR) diagram, 90% of all stars appear to be clustered in:

A. The "giant" category B. The "white dwarf" category C. The "supergiant" category D. The main sequence The main sequence How long will a main-sequence star with a mass equal to 20 solar masses and luminosity equal to 2000 solar luminosities live? Hint: A star's life in the main-sequence in solar units is equal to M/L A. 1/100 of the sun's lifetime B. 1/10 of the sun's lifetime C. 100 times the sun's lifetime D. 10 times the sun's lifetime 1/100 of the sun's lifetime Why do more massive stars live shorter lives? A. Because they have less fuel available for nuclear burning B. Because gravity is stronger, leading to faster nuclear burning and higher luminosity, and faster depletion of their available nuclear fuel C. Because most of them are in binary systems D. Because they are bluer Because gravity is stronger, leading to faster nuclear burning and higher luminosity, and faster depletion of their available nuclear fuel What are the birthplaces of usually multiple stellar systems? A. Bok globules

Sort the following types of nuclear reactions with sensitivity to temperature (from less to more sensitive). pp (proton-proton) chain CNO cycle Triple-alpha Silicon burning What type of nuclear burning will take place in the Sun when it's on its way to become a red giant star? A. Core helium burning B. Core hydrogen burning C. Hydrogen shell burning D. Helium shell burning Hydrogen shell burning Sort the following stages of stellar evolution for a sun-like star from the earliest to the latest in sequence T-tauri star Main-sequence star Giant star Horizontal Branch(HB) star Asymptotic giant branch (AGB) star Planetary nebula White dwarf

What type of stellar cluster has the oldest population of stars? A. Open cluster B. Globular cluster Globular cluster How did the element Uranium most likely form? A. In the core of a star with the mass of the Sun B. In the core of a massive (>solar masses) star C. It existed in the Universe since the Big Bang D. During an energetic massive star explosion known as supernova During an energetic massive star explosion known as supernova Which of the following stars will most likely produce a black hole? A. A 1 solar mass star B. A 2 solar mass star C. A 7 solar mass star D. A 30 solar mass star company A 30 solar mass star What are some neutron stars pulsars? A. Because their magnetic axis is not aligned with their rotational axis and that creates a "lighthouse" effect that produces radio pulses B. Because they physically pulsate, changing in size

In your view, what methods below do astronomers use to study the Universe? a. Pen and paper b. Supercomputer simulations c. Telescopes d. All of the above All of the above Last week during class I mentioned that the U.S. is a global leader in Astronomy research. How would you go about verifying that claim? a. Compare the number of publications in professional peer-reviewed Astronomy journals coming from individuals and institutions in different countries. b. Compare the total budget allocations for basic research between different countries c. List number of space missions and planned new telescope constructions for each country. d. All of the mentioned methods. All of the mentioned methods When one experiment verifies the predictions of a scientific theory, then and only then it can become a law of physics. Select one: True

False False Which of the following constellations can be used to locate both the stars Aldebaran and Sirius? Select one: a. The Southern Cross b. Canis Major c. Aquarius d. The Big Dipper e. Orion Orion Which of the following constellations can be used to locate both the stars Aldebaran and Sirius? Select one: a. Cygnus b. Aquarius c. Orion d. Canis Majoris Orion

-Optical light Ultraviolet light → 100 nano-meters (100 x 10^-9 meters), Radio waves → 21 cm, X-rays → 1 nano- meter (10^-9 meters), Optical light → 500 nano-meters (500 x 10^-9 meters) Wien's law dictates that a hotter a black body is the brighter it is. Select one: True False False Match the observational objectives to the appropriate instruments needed. Search for signals that might have been produced by an alien intelligence Observations of hot, trapped gas in-between galaxy clusters (temperature=100,000,000 Kelvin degrees) Observation of the blast wave breaking out of a massive star when it goes supernova (temperature of about 1,000,000 Kelvin degrees) Detection of ripples in space produced by the merger of two black holes Study of the properties of interstellar dust Study of the first radiation to ever escape in the Universe (Cosmic background radiation) Radiotelescope X-ray telescope in orbit Ultraviolet telescope in orbit

Gravitational Wave Detector on the ground (i.e. LIGO in Louisiana) Infrared telescope in orbit Space-based telescope sensitive in the microwaves All of the infrared (IR) radiation penetrates through the Earth's atmosphere, reaching the ground. Select one: True False False Energy transfer via heat conduction is relevant for some stars, but not the Sun. Select one: True False True Convection is the transport of energy in the sun in a manner that involves: Select one: a. photons that diffuse out to the solar surface b. neutrinos depositing energy in the solar surface c.