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Half life of Ge

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A 1.00g of sample of Ge decays to 0.87 in 1.9hr. What is the half-life of Ge?
Please show how you arrive at the solution. thanks

a. 1.4 x 10(exponent 1)hr
b. 9.5 hr
c. 1.1 x 10(exponent negative 1) hr
d. 7.3 x 10(exponent negative 2) hr
e. 13 hr

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Problem:
A 1.00g of sample of Ge decays to 0.87 in 1.9hr. What is the half-life of Ge?
Please show how you arrive at the solution. thanks ...

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