Half life of radon is 3.82d. By what time would 99.9% of radon will be decayed.
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❁H❁E❁Y❁ ❁M❁A❁T❁E❁ ❁H❁E❁R❁E❁ ❁I❁S❁ ❁Y❁O❁U❁ ❁A❁N❁S❁W❁E❁R❁!❁
Required Time = 10*3.82
= 38.2 days
⚡H⚡O⚡P⚡E⚡ ⚡I⚡T⚡ ⚡W⚡I⚡L⚡L⚡ ⚡H⚡E⚡L⚡P⚡ ⚡Y⚡O⚡U⚡.⚡
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