1.

If \[{{N}_{0}}\] is the original mass of the substance of half life period \[{{T}_{1/2}}=5\] years, then the amount of substance left after 15 years is                                                                   [AIEEE 2002]

A.            \[{{N}_{0}}/8\]                    
B.            \[{{N}_{0}}/16\]
C.            \[{{N}_{0}}/2\]                    
D.            \[{{N}_{0}}/4\]
Answer» B.            \[{{N}_{0}}/16\]


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