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Grade 11Electric Current

two samples of radioactive substance have the same quantity, 1/16th portion of A and 1/256th portion of B remain undecayed after 8 hours, the ratio of half life periods of A and B is

ranganathan

7 Years agoGrade 11

1 Answer

Kapil Khare

7 Years ago

Let a and b be half life period of substance A and B.

1/16th means A has completed 4 half life period

$\implies$ 4a = 8hours

$\implies$ Half life period of A = a = 2 hours

1/256th means B has completed 8 half life period

$\implies$ 8b = 8hours

$\implies$ Half life period of B = b = 1 hour

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