Radioactive decay is a _____________ change?
Radioactive decay is a _____________ change?
A. Chemical
B. Nuclear
C. Physical
D. None of these
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The largest stable nucleus is ________________?
The largest stable nucleus is ________________?A. U-235
B. U-238
C. Pb-206
D. Bi-209The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?A. 159
B. 1837
C. 2537
D. 10000A radioactive substance does not emit________________?
A radioactive substance does not emit________________?A. α-ray
B. Proton
C. Position
D. β-rayThe ratio of atomic radius to its nuclear radius is about___________________?
The ratio of atomic radius to its nuclear radius is about___________________?A. 105
B. 108
C. 1012
D. 1015Use of molten metal as a coolant in fast breeder reactor helps in_________________?
Use of molten metal as a coolant in fast breeder reactor helps in_________________?A. Rapid heat transfer from the core
B. Accelerating the reaction rate in the core
C. Breeding neutrons
D. Accelerating the neutronsAtoms of U-238 and U-235 differ in structure by three_____________________?
Atoms of U-238 and U-235 differ in structure by three_____________________?A. Electrons and three protons
B. Protons
C. Neutrons
D. Electrons