Detection of Hydrogen Hydrogen is prevalent in the universe. Life in the universe is ultimately based on hydrogen. The are about 1xx 10^(23) atars in the universe. Assume that they are like our sun (radius 700.000 km, density, 1.4 g//cm^(-3) 3//4 hydrogen and 1//4 helium by mass). Estimate the number of stellar protons in the universe to one significant figure. In the 1920s, Cecilia Payne discovered, by spectral analysis of starlight , that hydrogen is the most abundant element in most stars.

Detection of Hydrogen Hydrogen is prevalent in the universe. Life in

1.	Detection of Hydrogen Hydrogen is prevalent in the universe. Life in the universe is ultimately based on hydrogen. The are about 1xx 10^(23) atars in the universe. Assume that they are like our sun (radius 700.000 km, density, 1.4 g//cm^(-3) 3//4 hydrogen and 1//4 helium by mass). Estimate the number of stellar protons in the universe to one significant figure. In the 1920s, Cecilia Payne discovered, by spectral analysis of starlight , that hydrogen is the most abundant element in most stars.
Answer» ANSWER :Mass of a typical star `=(4//3)XX(3.1)xx(7xx10^(8) m)^(3)xx(1.4xx10^(6) g m^(-3))=2xx10^(33) g` Mass of protons of typical star `=(2xx10^(33)g)xx(3//4+1//8)=1.8xx10^(33) g` Number of protons of a typical star `=(1.8xx10^(33) g)xx(6XX10^(23) g^(-1))=1xx10^(57)` Number of stellar protons in the universe `=(1xx10^(57))xx(10^(23))=1xx10^(80)` SOL.