A galaxy is observed receding from Earth with a speed of 2800 km/s. If the Hubble constant is 22 km/s per million light-years, estimate how many years ago the light that we presently see from the galaxy actually left the galaxy. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) O 1.3 × 10^8 y O 4.2 × 10^8 y O 4.2 × 10^7 y O 1.4 x 10^7 y
A galaxy is observed receding from Earth with a speed of 2800 km/s. If the Hubble constant is 22 km/s per million light-years, estimate how many years ago the light that we presently see from the galaxy actually left the galaxy. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s) O 1.3 × 10^8 y O 4.2 × 10^8 y O 4.2 × 10^7 y O 1.4 x 10^7 y
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Transcribed Image Text:A galaxy is observed receding from Earth
with a speed of 2800 km/s. If the Hubble
constant is 22 km/s per million light-years,
estimate how many years ago the light
that we presently see from the galaxy
actually left the galaxy. (c = 3.00 ×
108 m/s, 1 ly = 9.461 × 1015 m, 1 y =
3.156 × 107 s)
O 1.3 × 10^8 y
O 4.2 × 10^8 y
O 4.2 × 10^7 y
O 1.4 x 10^7 y
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