Name: SAT Math Help & School Math Mastery
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#14675

exponential

applications

easy

75 sec

A radioactive substance decays such that its mass halves every 20 years. If the initial mass is 1200 grams, which equation represents the mass $M (t)$ , in grams, after $t$ years?

A.

$M (t) = 1200 (20)^{t}$

B.

$M (t) = 1200 (\frac{1}{2})^{\frac{t}{20}}$

C.

$M (t) = 1200 (\frac{1}{2})^{20 t}$

D.

$M (t) = 1200 (2)^{\frac{t}{20}}$