Light,leaving a Point Source,spreads Out So That the Apparent Brightness,b,of $\alpha$

question 89

Multiple Choice

Light,leaving a point source,spreads out so that the apparent brightness,b,of light per unit area varies with distance d according to which law ( $\alpha$ means "proportional to") ?

• A) b \(\alpha\) 1/d².
• B) b = constant.
• C) b \(\alpha\) 1/d.
• D) b \(\alpha\) d².

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