A radioactive sample has a half-life of 5.0 min.What fraction of the sample is left after 20 min? 1/2 1/8 1/16 1/4 The f

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answerhappygod
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A radioactive sample has a half-life of 5.0 min.What fraction of the sample is left after 20 min? 1/2 1/8 1/16 1/4 The f

Post by answerhappygod »

A radioactive sample has a half-life of 5.0 min.What fraction of
the sample is left after 20 min?
1/2
1/8
1/16
1/4
The focal lenght of a convex lens 100m. What is the power of the
lens?
+1D
-1D
1watt
-1 watt
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