Physics Nuclei

The rest mass of the deuteron, proton and neutron is equivalent to energy of 1877MeV, 939MeV, 940MeV respectively. A deuteron may disintegrate to a proton and neutron if it.

The binding energy (in MeV) of a nitrogen nucleus $\left({}_7^{14}N\right)$  is :

(Given mass of nucleus $m\left({}_7^{14}N\right)=14.00307u$ , mass of proton $m_p=1.00783u$ , mass of neutron $m_n=1.00867u$ and $1u=931.5\mathrm{M}\mathrm{e}\mathrm{V}/{\mathrm{c}}^2$  )

A radioactive sample decays with a constant of (1/3)logₑ2 s⁻¹. If initially there are 200 nuclei present, find the number of nuclei decayed during the first 9 seconds.

A radioactive β –emission. A detector records n β –particles in 2s and by next 2s (accumulatively) it records 1.1 n β –particle. Number of β –particles recorded by detector after a long time, is

The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to $(1/16{)}^{\text{th}}$  of its initial value?

From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire:

A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64 . The ratio of radius of two daughter nuclei respectively is :

A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64 . The ratio of radius of two daughter nuclei respectively is :

The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be:

A radioactive nucleus ${}_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}$ undergoes spontaneous decay in the sequence  ${}_{\mathrm{Z}}^{\mathrm{A}}\mathrm{X}\to {}_{\mathrm{Z}-1}\mathrm{B}\to {}_{\mathrm{Z}-3}\mathrm{C}\to {}_{\mathrm{Z}-2}\mathrm{D}$ , where $\mathrm{Z}$ is the atomic number of element $\mathrm{X}$ . The possible decay particles in the sequence are: