Give the equation form of the exponential law of radioactive decay.

  • A
    $N = N_0 e^{-\lambda t}$
  • B
    $N = N_0 e^{\lambda t}$
  • C
    $N = N_0 (1 - e^{-\lambda t})$
  • D
    $N = N_0 / e^{-\lambda t}$

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