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Chapter 18 Atomic and Nuclear Physics-19
1.
Which radioisotope is present in some rocks?
a) Stable potassium isotope K-40
b) Stable potassium isotope K-20
c) Un stable potassium isotope K-40
d) Un stable potassium isotope K-20
2.
What is the half-life of K-40?
a) 11460 years
b) 2.4 × 10
8
Years
c) 1620 years
d) 5370 years
3.
After how many years, unstable radioisotope K-40 decays into stable argon nuclide Ar-40?
a) 11460 years
b) 2.4 × 10
8
Years
c) 5370 years
d) 1620 years
4.
After 2.4 × 10
8
Years, unstable radioisotope K-40 decays into stable..................?
a) Potassium isotope K-42
b) Argon nuclide Ar-40
c) Potassium isotope K-40
d) Argon nuclide Ar-42
5.
The C-14: C-12 ratio in a fossil bone is found to be 1/4th that of the ratio in the bone of a living animal. The half- life of C-14 is 5730 years what is the approximate age of the fossil?
a) 5730 years
b) 11640 years
c) 5370 years
d) 11460 years
6.
What is the unit of energy used in atomic physics?
a) Electron volt
b) Joule
c) Pascal
d) Newton
7.
In artificial nuclear transmutation, an unstable nucleus changes into a more stable nucleus when we bombarded it with particles like………….?
a) Electron
b) Alpha particle
c) Proton
d) Neutron
8.
What is the famous example of artificial nuclear transmutation?
a) Chemical reaction
b) Nuclear fusion reaction
c) Biological reaction
d) Nuclear fission reaction
9.
Which reaction takes place when a heavy nucleus splits into two smaller nuclei by absorbing a slow moving neutron?
a) Chemical reaction
b) Biological reaction
c) Nuclear fission reaction
d) Nuclear fusion reaction
10.
What is the half-life of C-14?
a) 1260 years
b) 1620 years
c) 5730 years
d) 5370 years
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