Consider a bright star in our night sky. Assume its distancefrom the Earth is 20.0 light - years (ly) and its power outputis 4.00 x 1028 W, about 100 times that of the Sun. (a) Findthe intensity of the starlight at the Earth. (b) Find the powerof the starlight the Earth intercepts. One light - year is the distancetraveled by light through a vacuum in one year.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
Section: Chapter Questions
Problem 26P
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Consider a bright star in our night sky. Assume its distance
from the Earth is 20.0 light - years (ly) and its power output
is 4.00 x 1028 W, about 100 times that of the Sun. (a) Find
the intensity of the starlight at the Earth. (b) Find the power
of the starlight the Earth intercepts. One light - year is the distance
traveled by light through a vacuum in one year.

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