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According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?

According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?
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According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?

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User Manuel Schmitzberger
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According to the inverse square law of light, apparent brightness will decrease by a factor of 9. Use the formula
B=L/(4*pD^2), to check it.
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User Digestivee
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