.Empirical formula for the nuclear radius R is
1.ro A1/3
2.ro1/3 A
3.(ro A)1/3
4.ro A
A nucleus is symbolically represented as ZXA where A represents the number of
1.neutrons
2.protons
3.nucleons
4.electrons
Charge of a proton is equal to
1.1.6 ? 1019 C
2.1.66 ? 10-27 C
3.1.6 ? 10-19 C
4.1.66 ? 1027 C
Charge of the nucleus is due to
1.protons in it
2.neutrons in it
3.both protons and neutrons in it
4.electrons
Energy equivalent of 1 amu is equal to
1.1.66 ? 10-27 ? (3?108)2J
2.1.66 ? 10-27 ? 3?108 J
3.1.66 ? 10-27 ? 3?109 J
4.1.66 ? 10-8 J
Energy of an electron in atom and nuclear energy are respectively in the order of
1.MeV and eV
2.MeV and MeV
3.eV and eV
4.eV and MeV
Isotopes of a given element have28.
1.same mass number
2.same neutron number
3.same chemical properties
4.different chemical properties
Mass difference is equal to
1.Real mass � (Zmp + Nmn)
2.(Zmn + Nmp) � real mass
3.Real mass � (Zmn + Nmp)
4.(Zmp + Nmn) � real mass
Mass number refers to
1.the number of neutrons
2.the number of protons
3.the sum of the number of neutrons and protons in the nucleus
4.the number of positrons
Mass of proton is
1.1.007277 amu
2.1.6600 amu
3.1.008665 amu
4.1.00325 amu
Mass-energy equation is
1.E = m/c2
2.E = mc
3.E = m/c
4.E = mc2
Nuclear density is equal to
1.1.816 ? 1010 kg m-3
2.1.816 ? 1017 kg m-3
3.1.314 ? 104 kg m-3
4.1.314 ? 1010 kg m-3
Nuclear term A represents the number of
1.neutrons
2.protons
3.electrons
4.nucleons
Nuclei of isotopes have same
1.atomic number
2.neutron number
3.mass number
4.mass deflect
Nucleons are held together by
1.electrostatic force
2.nuclear force
3.magnetic force
4.gravitational force
One Fermi is equivalent to
1.10-10 m
2.10-12 m
3.10-15 m
4.10-16 m
Pick out isotopes from the following
1.1H1 6C12
2.7N15 8O16
3.1H3 2He3
4.92U235 92U238
Real nucleus mass is
1.greater than (Zmp + Nmn)
2.less than (Zmn + Nmp)
3.less than (Zmp + Nmn)
4.greater than (Zmn + Nmp)
The atomic mass unit (amu) is defined as 1/12 of the mass of
1.6C14 atom
2.6C11 atom
3.6C12 atom
4.6C13 atom
The atomic number Z of a element is equal to13.
1.the number of neutrons
2.the number of protons
3.the number of positrons
4.the sum of number of the neutrons and protons
The atomic number Z the neutron number N and the mass number A are related by
1.A � Z = N
2.A + Z = N
3.A + N = Z
4.2A= Z � N
The mass of a neutron is
1.1.00728 amu
2.1.00866 amu
3.1.66 amu
4.1.602 amu
The mass of proton is about
1.1836 times that of electrons
2.1836 times that of neutrons
3.1/1836 times that of electrons
4.1/1836 times that of neutrons
The neutron which is slightly
1.heavier than proton possesses charge
2.lighter than proton possesses charge
3.lighter than proton possesses no charge
4.heavier than proton possesses no charge
The radius of a nucleus is about
1.10-10m
2.10-11m
3.10-7m
4.10-14m
The radius of an atom is about
1.10-7m
2.10-10m
3.10-11m
4.10-14m
The term nucleon is used to refer to
1.electron
2.photon
3.positron
4.either neutron or proton
Which of the following are referred to as nucleons
1.protons and electrons
2.neutrons and electrons
3.neutrons and protons
4.neutrons and positrons
Which of the following is different for the isotopes of the same element
1.atomic number
2.atomic weight
3.number of electrons
4.number of protons