Decay with a known half-life: amount left or time taken

1. A.
   6 gm
2. B.
   8 gm
3. C.
   10 gm
4. D.
   12 gm

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1. A.
   $\frac{2\log 10}{\log 2}$
2. B.
   $\frac{\log 10}{\log 2}$
3. C.
   $\frac{3\log 10}{\log 2}$
4. D.
   $\frac{1}{2}\frac{\log 10}{\log 2}$

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1. A.
   20 grams
2. B.
   15 grams
3. C.
   12 grams
4. D.
   10 grams

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1. A.
   $\frac{1}{2}$
2. B.
   $\frac{1}{3}$
3. C.
   $\frac{1}{4}$
4. D.
   $\frac{1}{8}$

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1. A.
   $\ 2\log_{2}10$.
2. B.
   $\frac{4\log10}{\log2}$
3. C.
   $\ \log_{2}10$
4. D.
   $\frac{3\log10}{\log2}$

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1. A.
   $60$ minutes
2. B.
   $30$ minutes
3. C.
   $20$ minutes
4. D.
   $40$ minutes

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