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CBSE Class 12-science Answered

(i) Define 'activity' of a radioactive material and write its S.I. unit. (ii) Plot a graph showing variation of activity of a given radioactive sample with time. (iii) The sequence of stepwise decay of a radioactive nucleus is If the atomic number and mass number of D2 are 71 and 176 respectively, what aretheir corresponding values for D?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

(i) The total decay rate of a sample of one or more radionuclides is called the activity of that sample. The SI unit for activity is Becquerel, named after the discoverer of

radioactivity, Henry Becquerel.

(ii)

Variation of Activity of a given radioactive sample with time.

(iii)

In a decay an electron is emitted by the nucleus.

Therefore for D1 we can write

Mass number of D1 = Mass number of D2 = 176

Atomic number of D1 = Atomic number of D2 +1 = 71+1 = 72

In a decay the mass number and the atomic number of the daughter nucleus decreases by four and two, respectively.

Thus for D we can write,

Mass number of D = Mass number of D1 + 4 = 176 + 4 = 180

Atomic number of D = Atomic number of D1 + 2 = 72 + 2 = 74

Answered by | 04 Jun, 2014, 03:23: PM
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