A radioactive material is reduced to `1/16` of its original amount in 4 days. How much material should one begin with so that `4 xx 10^(-3) kg ` of the material is left after 6 days.

4 g of radioactive material of half-life 10 years is kept in a store for 15 years.How much material is disintergrated?

A certain radioactive material is known to decay at a rate proportional to the amount present. Initially there is 50 kg of the material present and after 2h it is observed that the material has lost 10% of its original mass. Based on these data answer the following questions. The time at which the material has decayed to one half of its initial mass is

A sample of radioactive substance is found 90% of its initial amount after one day . What % of the original sample can be found after 3 days?

The susceptibility of a magnetic material is -4.2 xx 10^-6 . Name the type of magnetic materials it represents.

Half life of a certain radioactive material is 140 days. After what lapse of time, the undecayed fraction of the material will be 25% ?

Half life of a certain radioactive material is 130 days. After what lapse of time, the undecayed fraction of the material will be 25% ?