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The figure shows a plot of number of neu...

The figure shows a plot of number of neutron (N) versus number of protons (z) in all stable nuclei found in nature. What kind of decay are nuclei X,Y and Z expected to show?

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`Xrarr` negative `beta` decay `Yrarr` positron emission `Zrarr` alpha decay
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Various rules of thumb have seen proposed by the scientific community to expalin the mode of radioactive decay by various radioisotopes. One of the major rules is called the n//p ratio. If all the known isotopes of the elemnts are plotted on a graph of number of neutrons (n) versus number of protons (p), it is observed that all isotopes lying outside of a ''stable'' n//p ratio region are radioactive as shown fig. The graph exhibits straight line behaviour with unit slope up to p=25 . Above p=25 , tgose isotopes with n//p ratios lying above the stable region usually undergo beta decay. Very heavy isotopes (pgt83) are unstable because of their relativley large nuclei and they undergo alpha decay. Gamma ray emission does not involve the release of a particle. It represnts a change in an atom from a higher energy level to a lower energy level. How would the radioisotope of magnesium with atomic mass 27 undergo radioactive decay?.

A plot of the number of neutrons (n) against the number of protons (p) of stable nuclei exhibits upward deviation from linearity for atomic number, Zgt 20. For an unstable nucleus having n//p ratio less than 1, the possible mode (s) of decay is (are)

The atoms of two element A and B contain the same number of protons but different number of neutrons in their nuclei. What kind of element are A and B?

Statement : The plot of atomic number ( y -axis ) versus number of neutrons ( x -axis ) for stable nuclei shows a curvature towards x-axis fron the line of 45^@ slope as the atomic number is increased . Explanation : proton -proton electrostatic repulsions begin to overcome attracive forces involving protons and neutrons in heavier nuclides.

Staements I: Light nuclei are most stable if N =Z, while heavy nuclei are more stable if N gtZ. (N rarr number of neutrons, Z rarr number of protons) Staements II: As the number of protons increases in a nucleus, the Coulomb's repulsive forece increases, which tends to break the nucleus apart. So, to keep the nucleus apart. So, to keep the nucleus stable, more number of neutrons are needed which are neutral in nature.

ARIHANT-NUCLEAR PHYSICS-All Questions
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  2. In a beam of neurons the particles are having a kinetic energy of 0.03...

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  3. The figure shows a plot of number of neutron (N) versus number of prot...

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  4. Which of the following isotopes is more stable and why? (a) .(3)^(7)...

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  5. Consider the position emission reaction .(z)^(A)Xrarrunderset(z-1)AY...

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  6. Tritium (.(1)^(3)H) is a radioactive isotope of hydrogen. It has a hal...

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  7. In the thorium decay series that begins with .^(232)Th,.^(228)Th alpha...

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  8. Nuclei of .^(64)Cu can decay be electron capture (probability 61%) or ...

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  9. In a sample there are two radioactive nuclide X and Y. Initially, popu...

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  10. It is known that the ratio of .^(14)C to .^(12)C atoms in living being...

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  11. Taking the data from last problem and assuming that 18% of our body ma...

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  12. Consider the nuclear decay reaction. .(z)^(A)Xrarrunderset(z-1)AY+(+...

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  13. The ratio (by weight) for U^(238) in a rock sample is 4:3. Assume that...

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  14. A radioactive species has decay constant of lambda=10^(-2)s^(-1). Prob...

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  15. A radioactive substance has a half life of t(0). Two particular nuclei...

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  16. In a sample of radioactive material the probability that a particular ...

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  17. Atomic mass of .(3)^(7)Li is 7.01600u and that of .(4)^(7)Be is 7.0169...

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  18. .(15)P^(32) is beta active and has a short half life of 14 days. The ....

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  19. A free neutron at rest, decays into three particles: a proton, an elec...

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