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The rate of radioactive decay of a radioactive element depends on which of the following?

1. Amount of radioactive element present
2. Temperature
3. Pressure
4. Isotopic form of the radioactive element

Correct answer: Amount of radioactive element present

Solution

The rate of radioactive decay follows the law: dN/dt = -lambda * N, where lambda is the decay constant (unique to each isotope) and N is the number of radioactive atoms present. Temperature and pressure have no effect on nuclear decay. Different isotopes of the same element have different decay constants, but the rate still depends on the amount (N) present.

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