Calculate the total number density ( ntot ) and the density ( ρ ) at a depth in a star composed of pure hydrogen where T = 9500 K and 35 % of the atoms are ionized (assume UI = 2). What percentage of hydrogen atoms are in the energy level n = 2?
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Calculate the total number density ( ntot ) and the density ( ρ ) at a depth in a star composed of pure hydrogen where T = 9500 K and 35 % of the atoms are ionized (assume UI = 2). What percentage of hydrogen atoms are in the energy level n = 2?
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- The temperature (T) of a planet (ignoring any other sources of heating) is solely a function of how far away the Sun is (d) and how bright it is (luminosity, L); planets are also reflective, so the light that they reflect (A) will not change their temperature: 1/4 L(1-A) T = 16σπα? o here is just a constant, like TT. 10. How much hotter is the Earth at perihelion than at aphelion? To answer this, solve for the ratio TT, where d, = r, (the perihelion distance) and d, = r, (the aphelion distance). You should have found that r, = 1.034rp. If you did not, use this new value and redo the previous problems.A cloud of gas has a temperature of 5,000 K. Estimate the width of the hydrogen H-alpha line with an intrinsic wavelength λ = 656 nm. (Note: the typical velocity of hydrogen atoms in a gas with temperature T is about (kT/mH)1/2, where k is Boltzmann constant and mH is the mass of a hydrogen atom, which is approximately the mass of a proton).What is the rate of thermal radiation emitted from a star with a radius of 4.11 x 109 m and a surface temperature of 3,222 K? Assume that the spherical surface behaves as a blackbody radiator.[Surface Area of a sphere = 4πr2; Area of a circle = πr2 or (π/4)d2]
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