How is the mean life of a given radiaoactive nucleus related to the decay constant ?

If the half-life of a radioactive nucleus is 3 days, nearly what fraction of the initial number of nuclei will decay on the 3rd day? (Given, 3sqrt(0.25)~~ 0.63 ).

What do you mean by half-life of a radioactive substance ?

How is the rate of effusion of a gas at a given temperature related to its pressure and molar mass?

What is mean life of radioactive substance ? Show its relation with half-life .

The half -life of a radioactive nucleus is 50 days. What is the time interval (t_2-t_1) between the time t_2 when 2/3 of it has decayed and the time t_1 when 1/3 of it had decayed ?

How does the density of a given mass of a gas vary with temperature at constant pressure?

0.0625g remains from 1g of a radioactive element after 20 years of radioactive decay. Determine the rate constant and half-life (t_(1//2)) of the reaction. How much of the element did remain after 10 years from the start?

How are formalin and trioxane related to methanal?

What is meant by pseudo unimolecular reaction? Explain with an example. 0.0625 g remains from 1 g of a radioactive element after 20 years of radioctive decay. Determine the rate constant and half-life (t_(1//2) of the reaction. How much of the element did remain after 10 years from the start?

The half-life of a radioactive isotope X is 50 years . It decays to another element Y which is stable . The two elements X and Y were found to be in the ratio of 1:15 in a sample of a given rock. The age of the rock was estimated to be