Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 20, Problem 43Q
To determine
The form of energy present during the supernova event which was later released as nuclear energy through radioactive decay.
The energy released in supernovae is in the form of neutrinos.
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Assume that the mass of the core of a star that just went Supernova type II is $2.5 \mathrm{M}_{\odot}$ before and after the collapse, while the Radius changes from $10^3 \mathrm{~km}$, before the collapse, to 12 km , after the collapse respectively.(a) What is the change in potential energy of the core between the two stages before and after the collapse?(b) Knowing that the luminosity of the Sun is $4 \times 10^{26} \mathrm{~W}$ how many years would it take the Sun to release the same amount of energy?
A Type Ia Supernova is an example of a:
During the collapse of a supernova explosion, calculate the change in gravitational potential
energy associated with the core size. Assume a typical core mass of 1.4 Msun and an initial
radius of 1000 km.
Chapter 20 Solutions
Universe: Stars And Galaxies
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- Why does a type Ia supernova explode? in two sentences.arrow_forwardThe exponential drop in the brightness of supernova 1987A was due to the decay of 56Ni (t1/2 = 6.1 days) → 56Co (t1/2 = 77.1 days) → 56Fe. If the energy were primarily due to the decay of 56Ni, what falloff in brightness by the end of 300 days would we expect? What if it were due to the energy in the decay of 56Co? The actual data showed a decrease in brightness by a factor of about 100 after 300 daysarrow_forwardWhat does mass exchange have to do with the occurrence of a type la supernova?arrow_forward
- Why does a type II supernova explode? in two sentences.arrow_forwardHow would the spectra of a type II supernova be different from a type Ia supernova? Hint: Consider the characteristics of the objects that are their source.arrow_forwardWhat observations from SN 1987A helped confirm theories about supernovae?arrow_forward
- How do the two types of supernovae discussed in this chapter differ? What kind of star gives rise to each type?arrow_forwardLife on Earth wouldn't be possible without supernovae. Why?arrow_forwardA supernova’s energy is often compared to the total energy output of the Sun over its lifetime. Using the Sun’s current luminosity, calculate the total solar energy output, assuming a 1010 year main-sequence lifetime. Using Einstein’s formula E=mc2 calculate the equivalent amount of mass, expressed in Earth masses. [Hint: The total energy output of the Sun over its lifetime is given by its current luminosity times the number of seconds in a year times its ten billion-year lifetime; ; mass of earth = 6×1024kg; c = 3×108m/s. Your answer should be 200-300 Earth masses.]arrow_forward
- (a)What type of supernova is most luminous in light? (b) What kind of star results in such an explosion? (c) What type of supernova is most luminous in neutrino emission? (d) What kind of star results in such an explosion?arrow_forwardWhy the Neutron stars do not collapse further?arrow_forward24 If the Temperature of the core of a supernova is 3200 x 1023 K, what should be the average translational kinetic energy of the particles moving inside this supernov (Boltzmann's constant = 1.38 x 10-23 J/K) Type your answer...arrow_forward
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