“How bright would the sun appear to an observer on Earth if the sun were four times farther from Earth than it actually is? Expr ess your answer as a fraction of the sun’s brightness on Earth’s surface.”
1 answer:
Like a lot of other things, (gravity, sound, electrostatic force), brightness also decreases as the square of the distance.
When the source moves to a new position that's 4 times as far away, its apparent brightness becomes (1/4^2) its original value.
That's 1/16 .
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