Question

Unit of decay constant of radioactive disintegration is:

• A. time
• B. min${}^{-2}$
• C. time${}^{-1}$
• D. time mol${}^{-1}$

Answer 1

Answer: (C)

time${}^{-1}$

Unit of decay constant of radioactive disintegration is the reciprocal of time or time ${}^{-1}$ as it is a first order decay. When time is in years, the unit of decay constant is year ${}^{-1}$