Number Density of Photons (Cosmology) - Physics Forums
2014年10月22日 · Homework Statement Given the maximum possible number density of stars in the present universe, assume that they have been radiating light for 10 billion years at a solar rate of ##3.9 \\times 10^{26} \\ W##. Photons emitted all have a restframe wavelength of 500 nm. Find a crude upper bound for...
How Do You Calculate Photon Number Density in a ... - Physics …
2013年9月15日 · Homework Statement In Problem 1 find the number density of photons in the sun’s core for the region of wavelengths between 599 nm and 601 nm. In problem 1 temperature is given. Homework Equations Planck blackbody formula and number density= constant times T^3 where T is temperature. The...
What is the Number Density of Gas Molecules at Sea Level?
2008年4月29日 · The number density of air is an important concept in atmospheric science and meteorology. It helps us understand the composition and behavior of the Earth's atmosphere, and is essential for studying air pollution and weather patterns.
Atomic number density and mass density - Physics Forums
2013年9月13日 · Atomic number density and mass density are important because they provide information about the composition and properties of a substance. They can also be used to calculate other important parameters, such as molar volume and molar mass, which are useful in various scientific calculations and experiments.
Current CMB photon number density? - Physics Forums
2010年1月6日 · The CMB photon number density is an important parameter in cosmology as it provides valuable information about the early universe. It is a remnant of the Big Bang and its characteristics, such as its temperature and number density, can help us understand the evolution of the universe and the formation of structures within it.
Solved Question 6 Homework = Answered Number Density - A
Question 6 Homework = Answered Number Density - A certain mystery metal has a molar mass of M=6.14Elg/mol, a mass density of ρ=9.71EO g/cm3, and has two valence electrons per atom. What is the number density of free electrons of this metal (in electrons per meter cubed)? Report your answer to 3 significant figures.
What is the correct equation for calculating free-electron density …
2009年1月6日 · Free-electron density refers to the number of unbound or loosely bound electrons per unit volume of a material. It is a measure of the electron cloud present in a substance and is an important factor in determining its electrical and thermal properties.
Number Density in the Atmosphere - Physics Forums
2006年11月30日 · Assume that the Earth's atmosphere has a uniform temperature of 20ºC and uniform composition, with an effective molar mass of 28.9 g/mol. a) show that the number density of molecules depends on height according to: nv (y) = (n0) e^ -(mgy)/kBT b) commercial jetliners typically cruise at an...
How Do You Calculate Pressure from Number Density and RMS …
2008年5月30日 · What is number density and how is it related to pressure? Number density refers to the number of particles per unit volume in a given substance. It is related to pressure through the ideal gas law, where pressure is directly proportional to the number density of gas molecules. What is the difference between number density and mass density?
Number density/average distance relationship question - Physics …
2014年5月4日 · Number density is a measure of the number of particles or objects per unit volume. It is calculated by dividing the total number of particles by the volume of the space they occupy. 2. How does number density affect the average distance between particles? The higher the number density, the closer the particles are to each other, resulting in a ...