For a certain radioactive substance, it is observed that after `4h`, only `6.25%` of the original sample is left undeacyed. It follows that.

It is observed that only 0.39% of the original radioactive sample remains undecayed after eight hours.Hence:

It is observed that only 0.39% of the original radioactive sample remains ndecayed after eighrt hours. Hence:

It is observerd that only 0.39% of the original radioactive sample remains undecayed after eight hours. Hence,

It is observerd that only 0.39% of the original radioactive sample remains undecayed after eight hours. Hence,

What percentage of radioactive substance is left after 5 half lives?

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?

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?