21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 16, Problem 4QP
To determine
The reason for which the degenerate matter is different from normal matter.
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Which of the following statements about novae is not true?
A. A nova involves fusion taking place on the surface of a white dwarf.
B. A star system that undergoes a nova may have another nova sometime in the future.
C. Our Sun will probably undergo at least one nova when it becomes a white dwarf about 5 billion years from now.
D. When a star system undergoes a nova, it brightens considerably, but not as much as a star system undergoing a supernova.
Is the answer C? Since the sun has no companion star, it cannot gain accreted matter to initiate a nova and so it would not undergo a nova, it would just undergo a type I supernova?
Thanks!
Where does gold (the element) come from?
A. It is produced during the supernova explosions of high-mass stars.
B. It was produced during the Big Bang.
C. It is produced by mass transfer in close binaries.
D. It is produced during the late stages of fusion in low-mass stars.
The triple-alpha process
a.
controls the pulsations in Cepheid variable stars.
b.
is the nuclear fusion of hydrogen to helium in massive stars.
c.
is the process that produces the neutrinos we receive from the sun.
d.
requires a temperature of about 5,000,000 K to operate.
e.
fuses helium nuclei to make carbon and occurs during helium flash.
Chapter 16 Solutions
21st Century Astronomy
Ch. 16.1 - Prob. 16.1CYUCh. 16.3 - Prob. 16.3CYUCh. 16.4 - Prob. 16.4CYUCh. 16.5 - Prob. 16.5CYUCh. 16 - Prob. 1QPCh. 16 - Prob. 2QPCh. 16 - Prob. 3QPCh. 16 - Prob. 4QPCh. 16 - Prob. 5QPCh. 16 - Prob. 6QP
Ch. 16 - Prob. 8QPCh. 16 - Prob. 9QPCh. 16 - Prob. 10QPCh. 16 - Prob. 11QPCh. 16 - Prob. 12QPCh. 16 - Prob. 13QPCh. 16 - Prob. 14QPCh. 16 - Prob. 15QPCh. 16 - Prob. 16QPCh. 16 - Prob. 17QPCh. 16 - Prob. 18QPCh. 16 - Prob. 19QPCh. 16 - Prob. 20QPCh. 16 - Prob. 21QPCh. 16 - Prob. 23QPCh. 16 - Prob. 24QPCh. 16 - Prob. 25QPCh. 16 - Prob. 26QPCh. 16 - Prob. 27QPCh. 16 - Prob. 28QPCh. 16 - Prob. 29QPCh. 16 - Prob. 30QPCh. 16 - Prob. 31QPCh. 16 - Prob. 32QPCh. 16 - Prob. 33QPCh. 16 - Prob. 34QPCh. 16 - Prob. 35QPCh. 16 - Prob. 36QPCh. 16 - Prob. 37QPCh. 16 - Prob. 38QPCh. 16 - Prob. 39QPCh. 16 - Prob. 40QPCh. 16 - Prob. 41QPCh. 16 - Prob. 42QPCh. 16 - Prob. 43QPCh. 16 - Prob. 44QPCh. 16 - Prob. 45QP
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- A helium flash occurs a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. under none of the above conditions.arrow_forwardThe diagram below shows an H-R diagram with life track of a 1-solar-mass star, with various stages labeled A through E. Temperature What will happen to the star after stage E? A. It will gain mass until it collapses under its own weight. B. It will begin burning carbon in its core. C. It will explode in a supernova. D. It will collapse to make a neutron star. E. It will eject a planetary nebula. Luminosity →arrow_forwardProtostar A. among the most massive and brightest stars Main Sequence B. a star after it has used all of its nuclear fuel Giant C. a gravitational field so strong that not even light can escape upergiant D. star in the longest stage of life (90% of stars) Neutron Star E. a super bright explosion of a star Black Hole F. created when a star loses its outer layers of gases White Dwarf G. extremely dense remnants of a dead star Black Dwarf H. young star in the early stages of formation jupernova 1. star that no longer gives off heat or light Planetary Nebula J. star that is larger and brighter than a main sequence star : A : E : Farrow_forward
- A neutron star can spin up to a. once a day. b. once an hour. c. once a minute. d. once a second. e. a hundred times a second.arrow_forwardHypernovae are thought to be a. a star greater than 20 solar masses collapsing into a black hole. b. binary systems involving mass transferred to a neutron star. c. binary systems involving mass transferred to a white dwarf. d. two main-sequence stars colliding. e. binary systems involving mass transferred to a black hole.arrow_forwardThe white dwarf that remains when our Sun dies will be mostly made of A. helium. B. carbon. C. neutrons. D. hydrogen. Is the answer B? Thanks!arrow_forward
- Which of the following statements about various stages of core nuclear burning (hydrogen, helium, carbon, etc.) in a high- mass star is not true? A. As each stage ends, the core shrinks and heats further. B. Each successive stage creates an element with a higher atomic number and atomic mass number. C. As each stage ends, the reactions that occurred in previous stages continue in shells around the core. D.Each successive stage lasts for approximately the same amount of time.arrow_forward3. Brown dwarfs are ____. a. stars with a very thick dust sphere around them, so they appear “brown” b. low mass M type stars with hundreds of planets c. an anomaly because they are extremely small but have relatively high temperature d. protostars that could not ignite the fusion of hydrogen at their core e. has a surface temperature of 2500 K by fusing hydrogen I asked this question onece already, but the answer I got said the answer was C because "AT 2700K THEY ARE HOT" or something to that effect. I tried to find a way to reply to that thread. My argument was that even if brown dwarfs were 2700k (and my book says that's closer to the temperature of red dwarfs and that brown dwarfs are usually around 1000K). Seeing that we are studying the life cycle and evolution of all stars, wouldn't either of those temperatures be on the relatively COOL side of all star temperatures? Wouldn't the most appropriate answer be D.?arrow_forwardThere is a mass–luminosity relation because a. hydrogen fusion produces helium. b. stars expand when they become giants. c. stars support their weight by making energy. d. the helium flash occurs in degenerate matter. e. all stars on the main sequence have about the same radius.arrow_forward
- Why don’t all supernova remnants contain pulsars? a. All supernova remnants do contain pulsars. b. Some supernova explosions form white dwarfs instead of the neutron stars necessary for pulsars. c. Pulsars slow down and quit producing the pulses before the supernova remnant dissipates. d. The pulsar may be tipped so that the beams do not sweep past Earth. e. b and carrow_forwardWhen a mass is transferred through the inner Lagrangian point in a binary system toward a white dwarf, the material forms a rapidly growing whirlpool of material known as a(n) a. accretion disk. b. Lagrangian point. c. Algol paradox. d. planetary nebula. e. supernova remnant.arrow_forward2. What must be the radius of a star of mass 2.0x10" kg so that the escape speed from this star is equal to 2x 10" m/s?arrow_forward
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