UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 19, Problem 23Q
(a)
To determine
The reason that the main-sequence stars such as Sirius (spectral type A1), Vega(A0), Spica (B1), Fomalhaut (A3), and Regulus (B7), among the 20 brightest stars, are younger than Sun.
(b)
To determine
Whether
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Chapter 19 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
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- If two stars, star A and star B, have equal luminosities, but star A has half the surface temperature of star B, what can we conclude about the size (radius or diameter) of star B relative to star A (the ratio RB/RA)?arrow_forwardif the nuclear fusion reaction of converting 4 H → He occurs at anefficiency of 0.7%, and that mass is converted into energy accordingto the equation E = mc2, then estimate the Main Sequence lifetime of the Sun (spectral type G2)in years if the Sun (⊙) has a surface luminosity L⊙ = 3.839×1033erg. Assume the Sun’s core (10% of the total mass) is convertedfrom H into He. The Sun’s mass is M⊙ = 1.9891 × 1033 garrow_forwardHow does this radius of Sirius B compare with that of Earth?arrow_forward
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