The decay constant of radium is $4.28 \times {10^{ - 4}}$ per year. Its half life will be ..........$years$
The decay constant of radium is $4.28 \times {10^{ - 4}}$ per year. Its half life will be ..........$years$
- A
$2000$
- B
$1240$
- C
$63$
- D
$1620$
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