The half-life of is ` '' _38^90 Sr ` Is 28 years. Determine the disintegration rate of its 5 mg sample.

The half life of "_38 ^90 Sr is 28 years. What is the disintegration rate of 15 mg of this isotope?

If the half life of radium is 1620 years then its decay constant is

The half life of a first order reaction is 10 years . The time taken by 10 g of the reactant to reduce its half is ______.

A radioactive isotope has a half life of T years : How long will it take the activity to reduce to 1%of its original value?

Sample of carbon obtained from any living organism has a decay rate of 15.3 decays per gram per minute. A sample of carbon obtained from very old charcoal shows a disintegration rate of 12.3 disintegrations per gram per minute. Determine the age of the old sample given the decay constant of carbon to be 3.839 xx 10^-12 per second

The half life of a first order reaction having rate constant k=1.7xx10^(-5) sec^(-1) is :