Moderate

The unit of decay constant is:

Correct answer: D. s^-1

  • A. m/s
  • B. m^-1
  • C. m
  • D. s^-1

Explanation

D is the right option because The decay constant, denoted by λ (lambda), represents the probability per unit time that a nucleus will decay. Its unit is per second (s^-1) because it measures the rate of decay over time.

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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.

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