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Pathways to Astronomy

Stephen E. Schneider

Chapter 65

Exploding White Dwarfs - all with Video Answers

Educators

Chapter Questions

02:09

Problem 1

Calculate the density of a $1-M_{\odot}$ white dwarf that has a radius of $10^{4} \mathrm{km}$.

Sarah Mccrumb
Sarah Mccrumb
Numerade Educator
01:21

Problem 2

How does the acceleration of gravity (Unit 16 ) on the surface of a $1-M_{\odot}$ white dwarf, which has a radius of $10^{4} \mathrm{km},$ compare to $g$ the acceleration due to gravity on the surface of the Earth?

Shoukat Ali
Shoukat Ali
Other Schools
01:01

Problem 3

What is the escape velocity (Unit 18 ) from the surface of a $1-M_{\odot}$ white dwarf that has a radius of $10^{4} \mathrm{km}$ ?

Narayan Hari
Narayan Hari
Numerade Educator
01:14

Problem 4

If the maximum luminosity of a Type la supernova is about $10^{10} L_{\odot},$ how far away would one have to be for the supernova to appear as bright as the full Moon (about $3 \times 10^{-3}$ watts/m $^{2}$ )? Express your answer in light-years.

Farhanul Hasan
Farhanul Hasan
Numerade Educator
01:20

Problem 5

If the maximum luminosity of a Type Ia supernova is $10^{10} L_{\odot}$ and the supernova remains at this brightness for 15 days, estimate how long our Sun would take to emit the same amount of energy.

Farhanul Hasan
Farhanul Hasan
Numerade Educator
03:27

Problem 6

IK Pegasi, a white dwarf/A-type main-sequence binary system 150 ly away, is a candidate to become a Type la supernova in the future. Assuming that it will reach a luminosity of $10^{10} L_{\odot}$ how bright will it appear from Earth? How many times brighter than an average star in our sky would it appear?

Zachary Warner
Zachary Warner
Numerade Educator