What is the solar radius of Rigel and Procyon B? - Physics Forums
2009年11月17日 · What is the average solar radius of a star? The average solar radius of a star can vary greatly, as stars come in different sizes. However, for stars similar to our sun, the average solar radius is around 695,700 kilometers. Can the solar radius of a star change over time? Yes, the solar radius of a star can change over time. As a star ages, it ...
Mass-radius relation of a white dwarf - calculating radius - Physics …
2017年4月1日 · Using this limit and the known mass of a white dwarf, the radius can be calculated using the equation R = (2.18 x 10^-5)(M^-1/3), where R is the radius in kilometers and M is the mass in solar masses.
How to calculate a star's luminosity/radius - Physics Forums
2019年7月30日 · This graph shows the solar spectrum as compared to a black body. It's close, but not exactly a black body. Second, what exactly is the radius of the sun? The density of the sun drops off from very high values in the interior to essentially zero at some large radius. It has no solid surface like the Earth. So where is the edge?
Formula for solar radiation pressure - Physics Forums
2005年9月4日 · Unless the solar radiation coefficient has units of /m^2. Maybe that's why it's thrown in? Furthermore, Intensity should change with distance. So I'm guessing that for Intensity I would use: Luminosity of the Sun (3.9e26 watts) * (area of a sphere of 1 solar radii / area of a sphere of radius = distance), which would give me Intensity in Watts.
Why can't Solar panels be hemispherical, or a curved strip type?
2024年11月29日 · So the radius of the disc must be about ##1.4 r##. It is sitting flat on the ground. On the other hand we have a hemispherical solar panel sitting flat on the ground with the domed side up. It has a surface area of ##2\pi r^2## as …
Find gravitational acceleration through luminosity - Physics Forums
2013年2月16日 · Homework Statement Use equation 1.3 to estimate the solar radius Ro from its luminosity and effective temperature. Show that the gravitational acceleration g at the surface is about 30 times larger than that on Earth.Homework Equations (1.3) L=4∏R2σSBT4The Attempt at a Solution Well we know the...
White dwarf mass-radius relationship - Physics Forums
2014年10月15日 · A solar mass white dwarf will have a radius that is 1/100th the radius of the Sun (or about 6900km). Of course, this relationship fails quite dramatically as M reaches 1.4 solar masses, and so it's not like the range of validity of this relationship is …
Monte Carlo problem - mean free path to a star - Physics Forums
2014年10月25日 · radius R = 7 × 10^8 m. How far, on average, could you see in any direction before your line of sight struck a star? (Assume standard Euclidean geometry holds true in this universe.) We are allowed to assume:-The universe is static-The stars are roughly homogeneously distributed-Every star has radius = solar radius Homework Equations My …
Decrease of Solar radius per year using Virial Theorem - Physics …
2020年12月17日 · The decrease of solar radius per year is calculated by using the Virial Theorem, which is a mathematical equation that relates the kinetic energy and potential energy of a system. In this case, the system is the Sun, and the decrease in solar radius is calculated by equating the gravitational potential energy of the Sun to its kinetic energy.
Relationship of temperature and radius. - Physics Forums
2006年1月25日 · Initially, a main sequence star has a surface temperature of 25000 K and a radius 10 times that of the sun. Its temperature drop to 5000 K as it becomes a supergiant. What is its radius in term of solar radii? a) 25 b) 50 c) 100 d) 250 e) 500 Well, I tried to do it using luminosity , L=4πR²σT⁴.