UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 20, Problem 74Q
To determine

The object among the planetary nebula and the supernova remnants as shown below. The body in which the gases would expand more rapidly, away from the central star. Both bodies comprise of glowing gases and are about the same age. (Provide the reason for the answer)

UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER, Chapter 20, Problem 74Q

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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.)
The ring around SN 1987A (see the figures below) initially became illuminated when energetic photons from the supernova interacted with the material in the ring. The radius of the ring is approximately 0.75 light-year from the supernova location. How long (in years) after the supernova did the ring become illuminated?
Suppose a protostar has a luminosity of 39,473 L⊙ and a surface temperature of 4,130 K (Kelvins). What is the radius of this protostar? [Enter your answer as a multiple of the Sun's radius. I.e., if you find R = 20 R⊙ , enter 20. This problem is easier if you start with the relevant equation and create a ratio using the Sun's values. Recall that the Sun has a surface temperature of 5778 K. ]

Chapter 20 Solutions

UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER

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