COSMIC PERSPECTIVE
COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135729458
Author: Bennett
Publisher: PEARSON
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Chapter 6, Problem 50EAP

(a)

To determine

To Compare: The light collecting area of one of the 10-meter Keck telescope to that of the 5-meter Hale telescope.

(b)

To determine

To Compare: The light collecting area of a 100 meter telescope to that of one of the 10-meter Keck telescope.

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Suppose astronomers built a 90-meter telescope. How much greater would it's light collecting area be than that of the 10-meter Keck telescope? Express your answer using two significant figures.
You record the spectrum of a distant star using a telescope on the ground on Earth. Upon analysing the spectrum, you discover absorption lines spaced at intervals typical of oxygen atoms. Which of the following are possible interpretations of this evidence? Select all that apply. The width of the spectral lines gives the diameter of the star The star is likely orbited by habitable planets with breathable atmospheres. The height of the spectral lines above the star's general blackbody spectral curve tells us how much oxygen is in the star The atmosphere of Earth contains oxygen The red or blueshift of the set of lines can tell us the speed of the star's motion toward or away from us
The 305-m-diameter Arecibo radio telescope pictured in figure below detected radio waves with a 9- cm average wavelength. Hint a. What was the angle between two just-resolvable point sources for this telescope? Minimum resolvable angle was urad. b. How close together could these point sources be at the 2.57 million light-year distance of the Andromeda Galaxy? (Note: Estimated radius of the Andromeda Galaxy is about 7 x 10¹7 km.) The point sources could be as close as resolvable distance. x1015 km for minimum

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COSMIC PERSPECTIVE

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