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

What is meant by radioactive substance?

A first order reaction has a half life period of 34.65 seconds. Its rate constant is

What do you mean by radioactive substance?

Some amount of a radioactive substance (half-life=10days) is spread inside a oun and consequently ,the level of radiation becomes 50 times the permissible level for normal occupancy of the room.After how many days,the room will be safe for occupataion?

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?