Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. Choose the correct statemnet about radioactivity:A. Radioactivity is a statistical process.B. Radioactivity is independent of high temperature and high pressureC. When a nucleus undergoes `alpha`- or - `beta`-decay, its atomic number changes.D. All of the these

Many unstable nuclie can decay spontaneously to a nucleus of lower mas

1.	Many unstable nuclie can decay spontaneously to a nucleus of lower mass but differnet combination of nucleons. The process of spontaneous emission of radiation is called radioactivity substance. Radioactive decay is a statistical process. Radiaactivity is independent of all external conditions. The number of decays per unit time or decay rate is called activity. Activity exponentially decrease with time. Mean lifetime is always greater than half-life time. Choose the correct statemnet about radioactivity:A. Radioactivity is a statistical process.B. Radioactivity is independent of high temperature and high pressureC. When a nucleus undergoes `alpha`- or - `beta`-decay, its atomic number changes.D. All of the these
Answer» Correct Answer - d Radioactivity is indeopendent of all external condiations. When a nucleus undergoes an `alpha`-decay, its atomic number decreases by 2 and in beta decay, atomic number increases by `1`.

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The binding energy per nucleon number for deutron `H_(1)^(2)`and helium ` He_(2)^(4)` are `1.1 MeV` and `7.0 MeV` respectively . The energy released when two deuterons fase to form a belium nucleus `He_(2)^(4)` is ……..A. `2.2MeV`B. `23.6MeV`C. `28.0MeV`D. `30.2MeV`
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A neutron breaks into a proton and electorn. Calculate the eenrgy produced in this reaction in `m_(e) = 9 xx 10^(-31) kg, m_(p) = 1.6725 xx 10^(-27) kg, m_(n) = 1.6747 xx 10^(-27) kg, c = 3xx10^(8)m//sec`.
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