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Pathways to Astronomy

Stephen E. Schneider

Chapter 66

Old Age and Death of Massive Stars - all with Video Answers

Educators

Chapter Questions

00:28

Problem 1

The Crab Nebula is 6,300 ly away. The supernova that formed it was observed from Earth in 1054 A.D. When, in fact, did the
supernova event occur?

Zachary Warner
Zachary Warner
Numerade Educator
00:48

Problem 2

If every proton in the core of a massive star turns into a neutron and releases one neutrino, how many neutrinos are produced? Assume the core contains $2 M_{\odot}$ and half the mass is made of protons $\left(M_{\text {proton }}=1.67 \times 10^{-27} \mathrm{kg}\right)$

Emily Himsel
Emily Himsel
Numerade Educator
02:43

Problem 3

Assume that $10^{12}$ neutrinos passed through every square meter of surface perpendicular to the radiation from Supernova 1987A (which was 160,000 ly away). How many neutrinos were produced by the explosion?

Shahab Ullah
Shahab Ullah
Numerade Educator
01:15

Problem 4

How long does it take the blast wave from the center of a star undergoing a supernova to reach the star's surface if the blast wave is traveling at $10,000 \mathrm{km} /$ sec and the star is about 100 times the size of the Sun?

Sri Datta Vikas Buchemmavari
Sri Datta Vikas Buchemmavari
Numerade Educator
01:20

Problem 5

Assuming an average collapse speed of $50,000 \mathrm{km} / \mathrm{sec}$, how long does a star take to collapse during the supernova stage if it starts off with a surface radius of $7 \mathrm{AU}$ and ends up at the surface of the neutron star core, $10 \mathrm{km}$ from the center of the star?

Farhanul Hasan
Farhanul Hasan
Numerade Educator
01:45

Problem 6

The Crab Nebula is today measured to be about 10 ly across. If it exploded in 1054 , what has its average speed been in kilometers per second?

Zachary Warner
Zachary Warner
Numerade Educator
04:12

Problem 7

Using the information in Table 66.1 , what is the luminosity of a giant star in the silicon fusion stage in solar luminosities? Assume that the core of this star is $1 \mathrm{M¤}$

Sarah Mccrumb
Sarah Mccrumb
Numerade Educator
01:57

Problem 8

It is estimated that in the final stages of fusion, a giant star produces a core of iron more massive than the Sun. From the energy release given in Table 66.1
a. how much energy is this (in joules)?
b. how long would it take the Sun to emit this much energy at its rate of $4 \times 10^{26}$ joules/sec?

Penny Riley
Penny Riley
Numerade Educator