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The decay constant of a radioactive subs...

The decay constant of a radioactive substance is 0.173 `(year)""^(-1)`. Therefore

A

nearly 63% of the radioactive substance will decay in `(1/0.173years)`

B

half life of the radio active substance is `(1/0.173years)`

C

One sixth of the radioactive substance will be left after 8 year

D

all the above statements are true

Text Solution

Verified by Experts

The correct Answer is:
a
`lamda=2.303/tlog.N""_(0)/N)`
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Knowledge Check

  • The decay constant of a radioactive sample

    A
    decreases as the atom becomes older
    B
    increases as the atom becomes older
    C
    is independent of the age
    D
    dependes on the nature of activity

  • The decay constant lambda of a radioactive sample:

    A
    Decreases with increase of external pressure and temperature
    B
    Increase with increase of external pressure and temperature
    C
    Decreases with increase of temperature and increase of pressure
    D
    Is independent of temperature and pressure.

  • The decay constant of a radioactive substance is 1 per month. The percentage of radioactive substance left undecayed after two months will be

    A
    `25%`
    B
    `50%`
    C
    `66%`
    D
    `87%`

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