Crystal

The crystal grows every month 1.2 permille of its mass. How many months to develop a crystal from weight 177 g to 384 g?

Correct answer:

n =  645.8

Step-by-step explanation:

q=1+10001.2=1.0012  m0=177 g m1=384 g  m1 = m0   qn qn = m1/m0  n log q = log (m1/m0)  n=log(m1/m0)/logq=log(384/177)/log1.0012=645.8



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