# Joint Entrance Examination/2000 Screening/Q022 Radioactive materials and decay constant

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| Original Question by Dharav Here's the question... Two radioactive materials X1 and X2 have decay constants 10λ and λ respectively. If initially they have the same number of nuciei, then the ratio of the number of nuclei of X1 to that of X2 will be 1/e after a time... (A) 1/10λ (B) 1/11λ (C) 11/10λ (D) 1/9λ Posted by Dharav 05:00, 18 August 2009 (UTC) | What's Up? Latest discussions on the forum Modern-Physics-Help User:Thewinster/HHF/Modern-Physics-Preload Joint Entrance Examination/AIEEE 2009/Q072 ENERGY Joint Entrance Examination/AIEEE 2009/Q075 TRANSITION Joint Entrance Examination/2000 Screening/Q006 Bohr model of an atom applied to an atom with some hypothetical particle Joint Entrance Examination/2000 Screening/Q001 X Ray Tungsten filament and electrons Physics-Help User:Thewinster/Sandbox User:Thewinster/Sandbox/Forum-Watch Joint Entrance Examination/2000 Screening/Q023 capcitors and dielectric, equivalent capcitance Joint Entrance Examination/2000 Screening/Q027 Wind power turbine relation between wind speed and output power Joint Entrance Examination/2000 Screening/Q030 Hollow Double Convex Lens with variable liquids inside |
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