How long would it take $4.00 \times 10 ^ { 20 }$ atoms to decay to $1.00 \times 10 ^ { 19 }$ atoms if their half-life was $14.7$ years?

Name: How long would it take $4.00 \times 10 ^ { 20 }$ atoms to decay to $1.00 \times 10 ^ { 19 }$ atoms if their half-life was $14.7$ years?
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The Answer of How long would it take $4.00 \times 10 ^ { 20 }$ atoms to decay to $1.00 \times 10 ^ { 19 }$ atoms if their half-life was $14.7$ years?

How Long Would It Take 4.00×10204.00 \times 10 ^ { 20 }4.00×1020

How Long Would It Take $4.00 \times 10 ^ { 20 }$