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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Exponential change and logarithms

Make the exponent dimensionless

A quantity follows N/N₀ = exp(−kt), with k = 0.50 min⁻¹.

Find the remaining fraction after 90 seconds.

Organize the givens & assumptions
  • N/N₀ = exp(−kt)
  • k = 0.50 min⁻¹
  • Elapsed time: 90 s

A constant positive rate coefficient and exponential decay. Use compatible time units in the exponent.

  1. Ae−1.5e^{-1.5}
  2. B0.750.75
  3. Ce−0.75e^{-0.75}
  4. De−45e^{-45}

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