Related Questions

Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
A 0.8
B 7.8
C 200
D 10000
β-rays emission in radioactive disintegration is always accompanied by the emission of
A γ-rays
B α-rays
C Neutrons
D None of these
A moderator, apart from its high neutron slowing power, and low non-productive neutron, should be
A Stable under nuclear radiation
B Corrosion resistant
C Good thermal conductor
D All of these
In β-decay of radioactive material, the ratio of neutron to proton
A Increases
B Remains same
C Decreases
D Is unpredictable; may increase or decrease
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
A 120
B 60
C 15
D none
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
Emission of β-particles during radioactive decay of a substance is from
A Innermost shell
B Nucleus
C Outermost shell
D None of these
The emission of an a-particle causes the resultant nucleus to have
A More atomic weight and less atomic number
B Less atomic weight and less atomic number
C Less atomic weight and more atomic number
D None of these
Critical energy should be __________ the neutron binding energy of the atom in order to initiate a nuclear fission.
A less than
B equal to
C either more or less
D more than
Half life of a radioactive isotope corresponds to the time required for half of the following to decay
A Electrons
B Protons
C Neutrons
D Atom

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