A radioactive substance follows dN/dt = −0.2N. The amount decreases because:
A radioactive substance follows dN/dt = −0.2N. The amount decreases because:
- A. Growth constant is negative
- B. Initial amount is positive
- C. Time is positive
- D. N is squared
Answer: A) Growth constant is negative
Explanation: Negative proportionality constant implies decay.
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