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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

sometimes equal to its atomic number

D

sometimes more than and sometimes equal to its atomic number

Text Solution

Verified by Experts

The correct Answer is:
C, D
A and Z are sometimes equal e.g. for hydrogen nucleus `(._(1)H^(1)), Z=A=1`, for other nuclei
(e.g. `._(6)C^(13), A=13, Z=6`) so AgtZ.
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PRADEEP-ATOMS AND NUCLEI-Exercise
  1. Bohr's model of hydrogen atom.

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  2. The electron in a hydrogen atom make a transtion n(1) rarr n(2) where...

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  3. The mass number of a nucleus is

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  4. As the mass number A increases, which of the following quantities rela...

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  5. During a nuclear fusion reaction,

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

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  7. The half-life period of a radioactive element x is same as the mean li...

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  8. Assume that the nuclear binding energy per nucleus (B//A) versus mass...

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  9. A star initially has 10^(40) deuterons. It produces energy via the pr...

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  10. The nucear forces

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  11. Which of the following products in a hydrogen atom are independent of ...

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  12. Let A(0) be the area enclined by the orbit in a hydrogen atom .The gra...

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  13. A radioactive sample consists of two distinct species having equal num...

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  14. A deutron is bombarded on .8 O^16 nucleus and alpha-particle is emitte...

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  15. The heavier nuclei tend to have larger N//Z ratio because

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  16. Let m(p) be the mass of a poton , M(1) the mass of a (10)^(20) Ne nucl...

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  17. An electron in hydrogen atom first jumps form second excited state to ...

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  18. In Bohr model of the hydrogen atom, let R,v and E represent the radiu...

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  19. Two deutrons each of mass m fuse to form helium resulting in release o...

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  20. In an e^(-) transition inside a hydrogen atom, orbital angular momentu...

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