The helf life period o a radioactive substace is 30 days.What is the time taken for `3//4th` of its original mass to disintegrate?

The half life period of a first order reaction is 3 minutes. Calculate the time taken to complete 75% of the initial concentration.

A certain radioactive substance has a half period of 30 days. What is disintegration constant?

Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as -(dN)/(dt)=lambdaN Where lambda= decay constant, N= number of nuclei at time t, N_(0) =intial no. of nuclei. The above equation after integration can be represented as lambda=(2.303)/(t)log((N_(0))/(N)) Calculate the half-life period of a radioactive element which remains only 1//16 of its original amount in 4740 years: a) 1185 years b) 2370 years c) 52.5 years d) none of these

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