Nuclei Test - 5...

A radioactive sample has an initial activity of $$50\ dpm$$, $$20$$ minute later, the activity is $$25\ dpm$$. How many atoms of the radioactive nuclide were there originally ?

What is the binding energy per nucleon of $$_{6}C^{12}$$ nucleus?
Given : mass of $$C^{12}(m_c)=12.000\ u$$
mass of proton $$9M_p)=1.0078\ u$$
mass of neutron $$(m_n)=1.0087\ u$$ and
$$1\ amu=931.4\ MeV$$

$$O^{19}\longrightarrow F^{19}+e+\bar v$$
In this decay, the rest mass energy of $$O^{19}$$ and $$F^{19}$$ are $$17692.33\ MeV$$ and $$17687.51\ MeV$$ respectively. The $$Q$$ factor of the decay is :

The atomic mass of $$B^{10}$$ is $$10.811\ amu$$. The binding energy of $$B^{10}$$ nucleus is [ Given: The mass of electron is $$0.0005498\ amu$$, the mass of proton is $$m_p=1.007276\ amu$$ and the mass of neutron is $$m_n=1.008665\ amu$$]:

$$\alpha,\beta$$ and $$\gamma$$ radiations come out of a rodiactive substance

Radioactivity can be effected by :

The binding energy of $$Na^{23}$$ is [ Given : Atomic mass of $$22.9898\ amu$$ and that of $$^1 H_1$$ is $$1.00783\ amu$$]:

A binding energies per nucleon for a deuteron and an $$\alpha-$$ particle are $$x_1$$ and $$x_2$$ respectively. What will be the energy $$Q$$ released in the reaction?
$$_{1}H^{2}+_{1}H^{2}\longrightarrow _{2}He^{4}+Q$$

The critical mass of fissionable uranium $$235$$ can be reduced by:

As the mass number A increases, the binding energy per nucleon in a nucleus