Estimate the ideal gas and radiation pressure (in n/m 2 ) at the center of the white dwarf sirius b, using 3×10 7 k for the core temperature. compare these values with the estimated core pressure given by p core ≈ 23 πgrho 2 r 2 . hint: when calculating the (ideal) gas pressure, consider sirius b to be made of pure (fully ionized) carbon-12. you can use the average mass density of ∼3×10 9 kg/m 3 . (b.) given what you found in part (a), what fraction of the total pressure in the core is likely to have to be from electron-degeneracy pressure (as opposed to gas and radiation pressure)?

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

metals only

metalloids only

nonmetals only

metal and metalloids

metalloids and nonmetals