Connect Access Card for Integrated Science
Connect Access Card for Integrated Science
7th Edition
ISBN: 9781259350412
Author: Bill W Tillery, Eldon Enger, Frederick C Ross
Publisher: McGraw-Hill Education
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Chapter 12, Problem 5PEA
To determine

The number of 10-solar-mass stars formed in nebula.

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For a main sequence star with luminosity L, how many kilograms of hydrogen is being converted into helium per second? Use the formula that you derive to estimate the mass of hydrogen atoms that are converted into helium in the interior of the sun (LSun = 3.9 x 1026 W). (Note: the mass of a hydrogen atom is 1 mproton and the mass of a helium atom is 3.97 mproton. You need four hydrogen nuclei to form one helium nucleus.)
At the average density of of a star-forming molecular cloud, about 1180 atoms per cm3, determine how large a sphere you would need to encompass mass equal to that of the Sun? Enter the radius of this sphere in light-years. (HINTS: 1180 atoms per cm3 corresponds to a density of 1.97×10-18kg/m^3; the mass of the Sun is 2×1030kg)
______________________________ require(s) that a young hot star (T ≥ 25,000 K) be relatively nearby.   a. Emission nebulae   b. HI regions   c. Molecular clouds   d. The hot gas of the interstellar medium   e. 21-cm radiation
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