The half-life of \[_{92}{{U}^{238}}\] is \[4.5\times {{10}^{9}}\] years. After how many years, the amount of \[_{92}{{U}^{238}}\] will be reduced to half of its present amount [CPMT 1990; MP PET 1999]

\[4.5\times {{10}^{4.5}}\] years

\[13.5\times {{10}^{9}}\] years

\[4.5\times {{10}^{4.5}}\] years

The half-life of \[_{92}{{U}^{238}}\] is \[4.5\times {{10}^{9}}\] year

1.	The half-life of \[_{92}{{U}^{238}}\] is \[4.5\times {{10}^{9}}\] years. After how many years, the amount of \[_{92}{{U}^{238}}\] will be reduced to half of its present amount [CPMT 1990; MP PET 1999]
A.	\[9.0\times {{10}^{9}}\] years
B.	\[13.5\times {{10}^{9}}\] years
C.	\[4.5\times {{10}^{9}}\] years
D.	\[4.5\times {{10}^{4.5}}\] years
Answer» D. \[4.5\times {{10}^{4.5}}\] years

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The half-life of \[_{92}{{U}^{238}}\] is \[4.5\times {{10}^{9}}\] years. After how many years, the amount of \[_{92}{{U}^{238}}\] will be reduced to half of its present amount [CPMT 1990; MP PET 1999]

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