Which Expression Correctly Describes the Radioactive Decay of a Substance

Multiple Choice

Which expression correctly describes the radioactive decay of a substance whose half-life is T?

A) N(t) = N₀e^{-(t ln2) /T}
B) N(t) = N₀e^-t/T
C) N(t) = N₀e^-tT
D) N(t) = N₀e^{-tT ln2}
E) N(t) = N₀e^{-t/T ln2}