EBK FOUNDATIONS OF ASTRONOMY
EBK FOUNDATIONS OF ASTRONOMY
14th Edition
ISBN: 8220106820612
Author: Backman
Publisher: YUZU
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Chapter 14, Problem 2SOP
To determine

The size of golf ball required to represent the Earth.

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(Astronomy) White Dwarf Size I. The density of Sirius B is 2×106 g/cm3 and its mass is 1.95×1030 kg. What is the radius of the white dwarf in km? (Hint: Density = mass/volume, and the volume of a sphere is 4/3πr3) Please round your answer to two significant digits.
What characterizes a star of spectral-type A in the visible part of the spectrum? Strong lines from neutral atoms and some molecules. A smooth, featureless spectrum. Strong Hydrogen lines and not much else. Very weak Hydrogen lines with lots of strong lines from neutral atoms.
Let us imagine that the spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest absorption line of hydrogen in the visible part of the electromagnetic spectrum) to be observed at 656.5 nm instead of 656.3 nm as measured in a lab here on Earth. What is the velocity of this star in m/s? (Hint: speed of light is 3*10^8 m/s; leave the units off of your answer) Question 4 of 7 A Moving to another question will save this response. 1 6:59 & backs
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