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Uses of Radioactive Substances

A radioactive...

Question

A radioactive substance decays 10% in 5 days. The amount remains after 20 days is what? [log 3 = 0.1771]

A

90%

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B

81%

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C

72%

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D

60.61%

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Solution

The correct option is D 60.61%
using half rate formula
$\frac{5}{20} = l n x / 90$
$x = 90 \times 0.67$
$60.6$

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