The half life of a radio active material is one hour.What would be the time required for `99.9%` completion

The half life of a radioactive material is 12.7 hr. What fraction of the original active material would become inactive in 63.5 hr.

The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the reaction will be (log2=0.301)

The half life of a radioactive substance is 24 hours. Time required for 12.5% of the original radioactive substance W remain is

The half-life period or a first order reaction is 1 hrs. What is the time in hour taken for 87.5% completion of the reaction?

50% of a radio active substance decays in 5 hours. The time required for the 87.5% decays is

If half-life of a radioactive element is 3 hours. After 9 hours its activity becomes

Half life time for first order reaction is 25 minutes . What time will be required for 99% completion of reaction ?