Radon has a half-life of 56s. After what time will it's activity be reduced to (a) 90% (b) 50% (c) 10% of it's initial value
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<em> </em><em>your</em><em> </em><em>formu</em><em>la</em><em> </em><em>is</em><em> </em><em>here</em><em> </em>
<em>hope </em><em>it's </em><em>helps</em><em> </em><em>u</em>
