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The mass number of a nucleus is....

The mass number of a nucleus is.

A

always less than its atomic number

B

always more than its atomic number

C

equal to its atomic number

D

sometimes more than and sometimes equal to its atomic number

Text Solution

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The correct Answer is:
D
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The mass number of a nucleus of an element is

form the relation R=R_0A^(1//3) , where R_0 is a constant and A is the mass number of a nucleus, show that the nuclear matter density is nearly constant (i.e., independent of A ).

In both beta^(-1) and beta^(+) decay processes, the mass number of a nucleus remains same, whereas the atomic number Z increases by one in beta^(-) decay and decreases by one in beta^(+) decay. Explain by giving reason.

Consider the following statements (A) and (B) and identify the correct answer given below. Statement (A): Positive values of packing fraction implies a large value of binding energy. Statement (B): The difference between the mass of the nucleus and the mass number of the nucleus is called packing fraction

The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be ?

Assertion Positive value of packing fraction implies a large value of binding energy. Reason The ratio of the difference between the atomic mass of nucleus and the mass number of the nucleus to that of atomic mass is called packing fraction.

The radius of a nucleus is given by r_(0) A^(1//3) where r_(0) = 1.3xx 10^(-15) m and A is the mass number of the nucleus, the Lead nucleus has A = 206. the electrostatic force between two protons in this nucleus is approximately

Knowledge Check

  • The mass number of a nucleus of an element is

    A
    Always less than its atomic number
    B
    Always more than its atomic number
    C
    Sometimes equal to its atomic number
    D
    Sometimes more than and sometimes equal to its atomic number.

  • When an alpha particle emitted from an unstable nucleus, the mass number of the nucleus

    A
    increases by 2
    B
    increases by 4
    C
    decreases by 4
    D
    decreases by 2

  • The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be ?

    A
    27
    B
    40
    C
    56
    D
    120
    • RESONANCE-NUCLEAR PHYSICS-Exercise-1 Part-2 Only one option correct type
    1. The mass number of a nucleus is.

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    2. The stable nucleus that has a radius 1//3 that of Os^(189) is-

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    3. The graph of 1n (R/R0) versus 1n A (R = radius of a nucleus and A = it...

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    4. For uranium nucleus how does its mass vary with volume?

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    5. Let Fpp, Fpn and Fnn denote the magnitudes of the nuclear force by a p...

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    6. As the mass number A increases, the binding energy per nucleon in a nu...

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    7. Which of the following is a wrong description of binding energy of a n...

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    8. The energy of the reaction Li^(7)+prarr2He^(4) is ( the binding energy...

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    9. Atomic weight of boron is 10.81 and it has two isotopes .5 B^10 and .5...

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    10. Which of the following process represents a gamma- decay?

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    11. An alpha particle is bombarded on ^14N. As a result, a ^17O nucleus is...

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    12. A free neutron decays into a proton, an electron and

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    13. Nuclei X decay into nuclei Y by emitting alpha-aprticles. Energies of ...

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    14. In one average-life,

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    15. A freshly prepared radioactive source of half-life 2 h emits radiation...

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    16. Two isotopes P and Q atomic weight 10 and 20, respectively are mixed i...

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    17. Ten grams of ^57 Co kept in an open container beta-decays with a half-...

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    18. A overset(lambda)rarr B overset(2 lambda)rarr C T=0 ,N(0) , 0 , T...

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    19. The half - life of I ^ (131) is 8 days. Given a sample of I^(131) at ...

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    20. 92^(U^(235) mucleus absorbs a slow neutron and undergoes fission into ...

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