Explanation:
Mass defect is the mass of the separated nucleons minus the actual mass of the bound nucleus. For helium-4, this is 2m(proton) + 2m(neutron) − m(helium).
5. The mass defect of a helium nucleus is converted mainly into:
A.
Binding energy
B.
Electron mass
C.
Atomic number
D.
Neutron number
Correct Answer:
Binding energy
Explanation:
According to mass-energy equivalence, the mass defect of the helium nucleus corresponds to its nuclear binding energy.
6. For a helium-4 nucleus, the mass number is equal to:
A.
2
B.
3
C.
4
D.
6
Correct Answer:
4
Explanation:
The mass number is the total number of protons and neutrons. A helium-4 nucleus contains 2 protons and 2 neutrons, giving a mass number of 4.
7. If the mass defect of a helium nucleus is Δm, its binding energy is given by:
A.
Δm/c²
B.
Δmc²
C.
Δm + c²
D.
c²/Δm
Correct Answer:
Δmc²
Explanation:
The binding energy associated with the helium nucleus mass defect is obtained using E = Δmc².
8. A helium nucleus has atomic number 2. This means that it contains:
A.
2 protons
B.
2 neutrons only
C.
4 protons
D.
4 electrons inside the nucleus
Correct Answer:
2 protons
Explanation:
The atomic number of an element equals the number of protons in its nucleus. Therefore, a helium nucleus contains 2 protons.
9. Which statement about the mass of a helium-4 nucleus is correct?
A.
It is greater than the sum of the masses of its nucleons
B.
It is less than the sum of the masses of its separate nucleons
C.
It is equal to the mass of one proton
D.
It is equal to the mass of one neutron
Correct Answer:
It is less than the sum of the masses of its separate nucleons
Explanation:
When two protons and two neutrons form a helium nucleus, some mass is converted into binding energy. Hence, the nucleus has a smaller mass than the separate nucleons.
10. The mass defect for a helium nucleus is commonly expressed in which unit when nuclear masses are given in atomic mass units?
A.
Atomic mass unit
B.
Metre per second
C.
Newton
D.
Coulomb
Correct Answer:
Atomic mass unit
Explanation:
When the constituent and nuclear masses are measured in atomic mass units, their difference, the mass defect, is also expressed in atomic mass units.
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Helium Nucleus Mass
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