Half-life of a substance is `10` years. In what time, it becomes `(1)/(4) th` part of the initial amount ?

Half life of a substance is 10 years. In what time it 1/4th part of the initial amount?

If half-life of a substance is 5 years, then the total amount of substance left after 15 years when initial amount is 64 g is

The half-life of a radioactive substance is 10 days. The time taken for the ((7)/(8)) th of the sample of disintegrates is

The half life of a substance is 30 years. What amount of it will be left after 120 years.

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 radiactive material is 4 days. Find the time required for 1//4 th of the initial number of radioactive nuclei of the element to remain undisintegrated.

The half life of radium is 1600 years. After how much time, (1)/(16)th part of radium will radium will remain undisintergrated in a sample?

The half-life of a radioactive substance is 100 years. Calculate in how many years the activity will decay to 1//10^(th) of its initial value.