Order-of-Magnitude Calculation 4: Can you estimate the temperature at which the core of a star starts...
Order-of-Magnitude Calculation 4: Can you estimate the temperature at which the core of a star starts nuclear fusion?
Homework Answers
The primary source of solar energy at similar size stars is fusion of hydrogen to form helium (proton - proton chain reaction ), which occurs at a core of a star at temperature of 14 million kelvin.
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Order-of-Magnitude Calculation 4: Can you estimate the
temperature at which the core of a star starts...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core,...
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 100 times that of the Sun, but a surface temperature 0.4 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is...
choose A B C D QUESTION 1 Star formation in giant gas clouds is a result...
choose A B C D QUESTION 1 Star formation in giant gas clouds is a result of competition between which forces? Light and rotation Light and dark Rotation and gas pressure Gravity and gas pressure 10 points QUESTION 2 What effect sets the largest size a star can have? The forming star is shining so strongly that it blows the collapsing gas cloud apart. If the star was any larger it would instantly form a Black Hole. If the...
What nuclide is produced in the core of a giant star by each of the following...
What nuclide is produced in the core of a giant star by each of the following fusion reactions? 10 5 B + 4 2 He rightarrow 15 7 N +4 2 He rightarrow 52 24 Cr + 4 2 He rightarrow Mass number and atomic number must be conserved in a nuclear reaction.
If you can measure the apparent magnitude of a star and known the absolute magnitude of...
If you can measure the apparent magnitude of a star and known the absolute magnitude of that type of star (e.g. RR Lyrae or Cepheids, then what can you determine distance temperature radius semi-major axis distance
Suppose that a 15 star finally runs out of nuclear fuel in its core and undergoes...
Suppose that a 15
star finally runs out of nuclear fuel in its core and undergoes a
Type II supernova explosion. You are going to analyse the energy
budget, calculating all the quantities in Joules.
a) Estimate the amount of gravitational energy that would be
liberated by the collapse of the core (say) 1.4 M
to the size of neutron star.
b) How much of this energy would be required to disintegrate the
iron nuclei in the core?
c) How...
1. Put the following stages of star formation into the proper sequence from earliest to latest:...
1. Put the following stages of star formation into the proper sequence from earliest to latest: Hint: When put into the proper order, each stage connects to the one before it and the one after it. Look for the key transition terms. A. Infalling material forms a hot and luminous protostar at the center of the disk. B. Newly-formed star settles onto the Main Sequence. C. Massive, rotating, amorphous interstellar cloud collapses and fragments. D. As the shrinking protostar heats...
Question 1) When does a protostar become a true star? Select one: a. when the star...
Question 1) When does a protostar become a true star? Select one: a. when the star is 1 million years old b. when the central temperature reaches 1 million Kelvin c. when nuclear fusion begins in the core d. when the thermal energy becomes trapped in the center Question 2: On average, what is the greatest mass a newborn star can have? Select one: a. 10 solar masses b. 50 solar masses c. 150 solar masses d. 300 solar masses...
Suppose you can just barely see a magnitude 17 (m=17) star through an amateur's 6-inch diameter...
Suppose you can just barely see a magnitude 17 (m=17) star through an amateur's 6-inch diameter telescope. Estimate the magnitude of the dimmest star you will be able to see through a 60 inch telescope. (The formulas I have are m2-m1=2.5log(F1/F2), and F=L/(4πD^2). m=magnitude, F=flux, L=luminosity, and D=distance
Which of the following statements about red giant stars are true? (Select all that apply.) Red...
Which of the following statements about red giant stars are true? (Select all that apply.) Red giant stars are less luminous than main sequence stars of the same temperature. Red giant stars tend to be more luminous than main sequence stars of the same temperatures because they are larger in size. Red giant stars are less luminous than main sequence stars because fusion happens more rapidly in main sequence stars. A red giant star of a given temperature is more...
How accurate do you think an "order of magnitude" cost estimate should be? Can you compare...
How accurate do you think an "order of magnitude" cost estimate should be? Can you compare and contrast a business case for a software project with a business case for replacing windows in a house where energy savings are being used as the reason for replacement? in your opinion. Please not copy and paste from google.
C. i. As a star runs out of hydrogen to fuel nuclear fusion in its core, changes within the star usually cause it to leave the main sequence, expanding and cooling as it does so. Would a star with a radius 100 times that of the Sun, but a surface temperature 0.4 times that of the Sun, be more, or less luminous than the Sun? Show and explain your reasoning. You may assume the surface area of a sphere is...
What nuclide is produced in the core of a giant star by each of the following fusion reactions? 10 5 B + 4 2 He rightarrow 15 7 N +4 2 He rightarrow 52 24 Cr + 4 2 He rightarrow Mass number and atomic number must be conserved in a nuclear reaction.
If you can measure the apparent magnitude of a star and known the absolute magnitude of that type of star (e.g. RR Lyrae or Cepheids, then what can you determine distance temperature radius semi-major axis distance
Suppose that a 15
star finally runs out of nuclear fuel in its core and undergoes a
Type II supernova explosion. You are going to analyse the energy
budget, calculating all the quantities in Joules.
a) Estimate the amount of gravitational energy that would be
liberated by the collapse of the core (say) 1.4 M
to the size of neutron star.
b) How much of this energy would be required to disintegrate the
iron nuclei in the core?
c) How...
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