Answer true or false. (a) Half-life is the time it takes...

Answer true or false. (a) Half-life is the time it takes one-half of a radioactive sample to decay. (b) The concept of half-life refers to nuclei undergoing alpha, beta, and positron emission; it does not apply to nuclei undergoing gamma emission. (c) At the end of two half-lives, one-half of the original radioactive sample remains; at the end of three half-lives, one-third of the original sample remains. (d) If the half-life of a particular radioactive sample is 12 minutes, a time of 36 minutes represents three half-lives. (e) At the end of three half-lives, only $12.5 \%$ of an original radioactive sample remains.

Transcript

00:01 Hello, so in this question there are various statements given and we need to assign whether this statement is true or false so one by one maybe it's all that in first statement it says half life is the time for half life is the time for a sample to decay half or a sample to decay half okay, so this is a true statement and that says the half that is a correct definition for half life.

00:36 So according to that, the half life is the time for which a sample decays to half of its concentration.

00:43 So this is again, this is a true statement.

00:46 Now when b statement it sees, half life does not apply to half life does not apply for gamma rays.

00:59 Or you can say gamma radiation or gamma emission.

01:02 So this is a false statement.

01:07 In fact, for metastable states, gamma emission is more preferred.

01:12 So half -life is applied for gamma radiations or gamma emissions.

01:18 So this is a false statement.

01:20 Next is, it says at end of two half -life, at the end of two half -lives, the amount of concentration that will remain is half, whereas at the end of three half -lives, the amount of sample that is left is one third remaining so this is a false statement because the half life has no relation with the denominator of concentration so this will be a false statement this is not necessary that third half life for third half life there will be 25 % of remaining in fact okay but here it is one third remaining so this is false statement now in d statement it says if half life for any sample is 12 minutes, so 36 minutes will be the third half life.

02:20 36 minutes will be the third half life...

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