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#21014

exponential

applications

medium

90 sec

A radioactive substance decays such that its mass halves every hour. If there are $120$ grams of the substance at the start of an experiment, which of the following represents the mass of the substance, $M$ , in grams $h$ hours after the start of the experiment?

A.

$M = 120 (2)^{h}$

B.

$M = 2 (120)^{h}$

C.

$M = 120 (\frac{1}{2})^{h}$

D.

$M = \frac{1}{2} (120)^{h}$