Its A. because it measures the rate of the decay of the isotope
Answer is: reaction is second order with respect to a.
This second order reaction<span> is proportional to the square of the concentration of reactant a.
</span>rate of reaction = k[a]².
k is second order rate constant and have unit M⁻¹·s⁻¹.
Integrated rate law for this reaction: <span><span>1/[a]</span>=<span>1/<span>[a]</span></span></span>₀ <span>+ kt.
t is time in seconds..</span>
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If you need to go through a closed door to escape a fire the action that you should take is letter B or <span>feel the door first using the back of your hand. </span>
