A. Innermost shell
B. Nucleus
C. Outermost shell
D. None of these
Related Mcqs:
- 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. 3/4th of it will disintegrate in two months
B. It will completely disintegrate in two months
C. It will completely disintegrate in four months
D. 1/8th of it will remain intact at the end of four months - 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 - Radioactive decay of a material involves a _____________ order reaction?
A. Third
B. Second
C. First
D. Zero - In β-decay of radioactive material, the ratio of neutron to proton____________________?
A. Increases
B. Remain same
C. Decreases
D. Is unpredictable; may increase or decrease - Radioactive decay is a _____________ change?
A. Chemical
B. Nuclear
C. Physical
D. None of these - The new nucleus formed after β-decay of a radioactive element has___________________?
A. Less atomic number
B. Less atomic weight
C. More atomic number
D. More atomic weight - A radioactive isotope undergoes decay with respect to time following _____________ law?
A. Logarithmic
B. Exponential
C. Linear
D. Inverse square - A radioactive substance does not emit________________?
A. α-ray
B. Proton
C. Position
D. β-ray - 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 - Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?
A. X
B. α and β
C. Neutrons & gamma
D. Infrared
