Home
Class 12
PHYSICS
Nuclei above bismuth-209 are unstable ir...

Nuclei above bismuth-209 are unstable irrespective of their neutron-proton ratio. Explain?

Text Solution

Verified by Experts

The electrostatic force of repulsion between the protons is greater in magnitude than the attractive force between nucleons in heavy nuclei above bismuth-209. Thus, heavy nuclei are unstable
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • NUCLEI

    MODERN PUBLICATION|Exercise TOUGH & TRICKY PROBLEMS|9 Videos

  • NUCLEI

    MODERN PUBLICATION|Exercise NCERT FILE SOLVED (TEXTBOOK EXERCISES)|22 Videos

  • NUCLEI

    MODERN PUBLICATION|Exercise PRACTICE PROBLEMS|38 Videos

  • MOVING CHARGES AND MAGNETISM

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|13 Videos

  • RAY OPTICS AND OPTICAL INSTRUMENTS

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|14 Videos

Similar Questions

Explore conceptually related problems

What happens to the neutron-proton ratio due to beta^(-) decay?

The atomic mass of lead is 208 and its atomic number is 82. The atomic mass of bismuth is 209 and its atomic number is 83. The ratio of neutrons/protons in the atom

Knowledge Check

  • Assertion: Nuclei above bismuth-209 are unstable irrespective o f their N : Z ratio. Reason: The force of repulsion between protons is greater than the attractive force between nucleons in nuclei above bismuth-209.

    A
    If both assertion and reason are correct and reason is a correct explanation o f the assertion.
    B
    If both assertion and reason are correct but reason is not the correct explanation o f assertion.
    C
    If assertion is correct but reason is incorrect.
    D
    If assertion is incorrect but reason is correct

  • When a beta -particle is emitted from a nucleus, the neutron-proton ratio

    A
    is decreased
    B
    is increased
    C
    remains the same
    D
    first decreases and then increases

  • When a beta^(-) particle is emitted from a nucleus, the neutrons-proton ratio:

    A
    is decreased
    B
    is increased
    C
    remains the same
    D
    first (A) then (B)

    • Similar Questions

    Explore conceptually related problems

    The atomic mass of the lead is 208u and its atomic number is 82, the atomic mass of bismuth is 209u and its atomic number is 83. The ratio of the neutrons // protons

    Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron.

    Unstable nuclei attain stability through disintegration. The nuclear stability is related to neutron proton ratio (n//p) . For stable nuclei n//p ratio lies close to unity for elements with low atmoic numbers (20 or less) but it is more than 1 for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays. while when n//p ratio is lower than required for stability, the nuclei either emits alpha -particles or a positron or capture K -electron.

    Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p) . n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers ( 20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha -particle or by emitting a positron or by K -electron capture. beta -particle is emiited in radioactivity by

    Unstable nuclei attain stability through disintergration. The nuclear stability is related to neutron- proton ratio (n//p) . n//p ratio for stable nuclei lies quite close to unity for elements with low atomic numbers ( 20 or less) but it is more than one for nuclei having higher atomic numbers. Nuclei having n//p ratio either very high or low undergo nuclear transformation. (i) When n//p ratio is higher than required for stability, the nuclei have the tendency to emit beta -rays, i.e. a neutron is converted into a proton. (ii) When n//p ratio is lower than required for stability, the nuclei increase the ratio, either by emitting alpha -particle or by emitting a positron or by K -electron capture. ""_(13)^(27)Al is a stable isotope , ""_(13)^(29)Al is expected to disintegrate by-

    Home
    Profile