The half life period of radium is $1600$ years. The fraction of a sample of radium that would remain after $6400$ years is
The half life period of radium is $1600$ years. The fraction of a sample of radium that would remain after $6400$ years is
- [AIPMT 1991]
- A
$\frac{1}{4}$
- B
$\frac{1}{2}$
- C
$\frac{1}{8}$
- D
$\frac{1}{{16}}$
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- [JEE MAIN 2018]
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- [AIIMS 2006]
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