Atoms and Nucle...

A nucleus decays by β⁺ – emission followed by a γ – emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively

If the binding energies of a deuteron and an α–particle are 1.125 MeV and 7.2 MeV, respectively, then the more stable of the two is

The particle A is converted into C via following reaction,
A → B + ₂ He⁴
B → C + 2e^-
Then,

The fraction of atoms of radioactive element that decays in 6 days is 7/8. The fraction that decays in 10 days will be

The binding energy per nucleon in a heavy nucleus is of the order of

1 curie represents

The radioactivity of a sample is I₁ at a time t₁ and I₂ at a t₂. If the half - life of the sample is t_1/2, then the number of nuclei that have disintegrated in the time t₂ – t₁ is proportional to

Consider an initially pure 3.4 g sample of ⁶⁷Ga, an isotope that has a half – life of 78h. What is its initial decay rate?

80 kg of a radioactive material reduces to 10 kg in 1 h. The decay constant of the material is