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	A radioactive substance has a half-life of 64.8 h. A sample containing this isotope has (Doubtnut) View
	A radioactive substance has a half-life of 64.8 h. A sample containing this isotope has an initi... (Doubtnut) View
	Radioactive `^138I has a half-life of 8.0 days .A sample containing ``^138I` has activity ` (Doubtnut) View
	A radioactive substance has a half-life of `h` days. Find a formula for its mass `m` in terms of (Doubtnut) View
	A certain sample of a radioactive marerial decays at the rate of 500 per second at a cartain tim... (Doubtnut) View
	`4xx10^23`tritium atoms are contained in a vessel. The half-life of decay of trituim nuclei is (Doubtnut) View
	The decay constant of `` 80^197Hg`(electron capature to `` 79^197Au`)is `1.8xx10^-4 s^-1`.( (Doubtnut) View
	``^57Co` decays to ``^57Fe` by`beta^+` -emission.The resulting ``^57Fe`is in its excited state (Doubtnut) View
	The count rate observed from a radioactive source at t sound was `N 0` and at 4t second it (Doubtnut) View
	The half-life of ^226Ra is 1602 y.Calculate the activity of 0.1g of RaCl 2 in which all the radi... (Doubtnut) View