Questions in nuclei

Select	Question
	The activity of a radioactive sample
	A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be
	If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be
	After five half lives what will be the fraction of initial substance
	Which is the correct expression for half-life
	A nucleus $_Z^AX$ emits an ?-particle. The resultant nucleus emits a ${\beta ^ + }$ particle. The respective atomic and mass no. of the final nucleus will be
	What fraction of a radioactive material will get disintegrated in a period of two half-lives
	The activity of a radioactive sample is 1.6 curie and its half-life is 2.5 days. Its activity after 10 days will be
	In a mean life of a radioactive sample
	Three fourth of the active decays in a radioactive sample in 3/4 sec. The half life of the sample is