Question

Dimensional formula for activity of a radioactive substance is

• A. \( \text{M}^{1} \text{L}^{0} \text{T}^{-1} \)
• B. \( \text{M}^{0} \text{L}^{1} \text{T}^{0} \)
• C. \( \text{M}^{0} \text{L}^{0} \text{T}^{-1} \)
• D. \( \text{M}^{1} \text{L}^{0} \text{T}^{-2} \)

Answer 1

The Correct Option is C

Activity is the rate of decay, and it is the number of decays per unit time.
Since it is inversely proportional to time, its dimensional formula is \(\text{T}^{-1}\), with no dependence on mass or length.