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If 10% of a radioactive material decays...

If `10%` of a radioactive material decays in `5` days, then the amount of original material left after `20` days is approximately.

A

0.6

B

0.65

C

0.7

D

0.75

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • 20% of a radioactive substances decay in 10 days . Calculate the amount of the original material left after 30 days.

    A
    0.512
    B
    0.628
    C
    0.15
    D
    0.2127

  • If 20% of a radioactive sample decays in 10 days, then the amount of substance left after 20 days will be approximately

    A
    0.6
    B
    0.61
    C
    0.63
    D
    0.7

  • If a radioactive material remains 25% after 16 days, then its half life will be

    A
    32 days
    B
    8 days
    C
    64 days
    D
    28 days

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