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accountkiller
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astronomy-particle density/interior temp of sun
The goal is to estimate the interior temperature of the Sun from its mass and particle density.
a)What is the average number density of particles within the Sun, given that the average mass per particle is about 10-24 gram?
b) What is the approximate temperature necessary for gas pressure to balance gravity within the Sun, given the average particle density from a)?
c) How does your estimate compare with the internal core temperature of the Sun?
It has a reference to a "Mathematical Insight" problem that uses the equation: Mbalance = 18Msun[tex]\sqrt{\frac{T^{3}}{n}}[/tex] ... Mbalance being the minimum mass required to balance the force between pressure and gravity in star formation, and n being particles per unit area.
a)
V = [tex]\frac{4}{3}[/tex] * [tex]\pi[/tex] * R3 = [tex]\frac{4}{3}[/tex] * [tex]\pi[/tex] * (6.95*108)3 = 1.406 * 1027 m3
density = mass / volume = (10-24 g) / (1.406 * 1027 m3) = 7.1 * 10-52 g/m3
Did I do that the right way? I have a weird feeling about the mass.. was I supposed to just use the mass/particle they gave me? So then my volume is the density of one particle per m3? I'm really confused on that, I'd appreciate any clearance.
b)
Well, I'm assuming this is the part they want us to use that mathemtical equation on.. but if I solve the equation for T, what is my Mbalance? Is it just what I got for volume times what I got for density? ... That would then be 9.98E-25 g - way too tiny!
c)
Not here yet.
Homework Statement
The goal is to estimate the interior temperature of the Sun from its mass and particle density.
a)What is the average number density of particles within the Sun, given that the average mass per particle is about 10-24 gram?
b) What is the approximate temperature necessary for gas pressure to balance gravity within the Sun, given the average particle density from a)?
c) How does your estimate compare with the internal core temperature of the Sun?
Homework Equations
It has a reference to a "Mathematical Insight" problem that uses the equation: Mbalance = 18Msun[tex]\sqrt{\frac{T^{3}}{n}}[/tex] ... Mbalance being the minimum mass required to balance the force between pressure and gravity in star formation, and n being particles per unit area.
The Attempt at a Solution
a)
V = [tex]\frac{4}{3}[/tex] * [tex]\pi[/tex] * R3 = [tex]\frac{4}{3}[/tex] * [tex]\pi[/tex] * (6.95*108)3 = 1.406 * 1027 m3
density = mass / volume = (10-24 g) / (1.406 * 1027 m3) = 7.1 * 10-52 g/m3
Did I do that the right way? I have a weird feeling about the mass.. was I supposed to just use the mass/particle they gave me? So then my volume is the density of one particle per m3? I'm really confused on that, I'd appreciate any clearance.
b)
Well, I'm assuming this is the part they want us to use that mathemtical equation on.. but if I solve the equation for T, what is my Mbalance? Is it just what I got for volume times what I got for density? ... That would then be 9.98E-25 g - way too tiny!
c)
Not here yet.
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