The half-life a radioacitve substance is `40` yeard. How long will it take to reduce to one fourth of its original amount and what is the value of decay constant ?

The half life of radioactive substance is 10 year. How long will it take to reduce to one fourth of its original amount and what is the value of its decay constant ?

The half-life of a radioactive element is 1580 years. How long will it take to reduce to 1/4th of its original mass ?

The half life of a radioactive substance is 13 years. The decay constant is

A radioactive isotope has a life of T years. How long will it take the activity to reduce to (a) 1% of its original activity?

The half life period of a radioactive isotope of X is 15 hours. How long will it take for its activity to be reduced to 1/16 of its original value ?

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

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?