Q. No.If \(M(A,Z)\), \(M_p\) and \(M_n\) denote the masses of the nucleus \({}_{Z}^{A}\mathrm{X}\), proton, and neutron respectively in units of u (\(1\) u = \(931.5\) MeV/c2) and \(BE\) represents its binding energy in MeV, then:
1.
\(M(A, Z)=ZM_p+(A-Z) M_n-B E / c^2\)
2.
\({M}({A}, {Z})={ZM}_{p}+({A}-{Z}) {M}_{n}+{BE}\)
3.
\(M(A, Z)=ZM_p+(A-Z) M_n-B E\)
4.
\({M}({A}, {Z})={ZM}_{p}+({A}-{Z}) {M}_{n}+{BE/c}^2 \)
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In radioactive decay process, the negatively charged emitted β-particles are:
1. the electrons present inside the nucleus
2. the electrons produced as a result of the decay of neutrons inside the nucleus
3. the electrons produced as a result of collisions between atoms
4. the electrons orbiting around the nucleus
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A nucleus has mass represented by M(A, Z). If Mp and Mn denote the mass of proton and neutron respectively and BE the binding energy, then :
1.
2.
3.
4.
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Two radioactive substances A and B have decay constants 5λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of the number of nuclei of A to those of B will be after a time interval:
1.
2.
3.
4.
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| 1. | \(25.8\) MeV | 2. | \(23.6\) MeV |
| 3. | \(19.2\) MeV | 4. | \(30.2\) MeV |
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In a radioactive material, the activity at time t1 is R1 and at a later time t2, it is R2. If the decay constant of the material is λ, then:
1.
2.
3.
4.
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The radius of Germanium (Ge) nuclide is measured to be twice the radius of . The number of nucleons in Ge are:
1. 73
2. 74
3. 75
4. 72
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-particle consists of:
1. 2 protons only
2. 2 protons and 2 neutrons only
3, 2 electrons, 2 protons, and 2 neutrons
4. 2 electrons and 4 protons only
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Choose the incorrect assertion regarding binding energy per nucleon:
1. Binding energy per nucleon is practically constant for nuclei with mass numbers between 30 and 170.
2. Binding energy per nucleon is maximum for (equal to 8.75 meV).
3. Binding energy per nucleon for is lower compared to .
4. Higher the binding energy per nucleon, the more unstable is the nucleus.
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Which of these is Q-value of decay of into ?
( represent masses of Na-atom, Ne-atom, and electron respectively)
1.
2.
3.
4.
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