A what is the half-life of the element b how long will it


1. An unknown radioactive element decays into non-radioactive substances.In ' 1000' days the radioactivity of a sample decreases by '62' percent.

(a) What is the half-life of the element?

(b) How long will it take for a sample of '100' mg to decay to '87' mg?

 

In what year did/will the exports reach $9.7 billion?

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Mathematics: A what is the half-life of the element b how long will it
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