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The mass number of a nucleus is....

The mass number of a nucleus is.

A

Always less then its atomic number

B

Always more than its atomic number

C

Always equal to its atomic number

D

Sometimes more than and sometimes equal to its atomic number

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The correct Answer is:
D
(d) In hydrogen, atomic number and mass number are equal.
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A2Z-NUCLEAR PHYSICS-Section D - Chapter End Test
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  2. If N(0) is the original mass of the substance of half - life period t(...

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  3. A radioactive sample at any instant has its disintegration rate 5000 d...

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  4. Which of the following atoms has the lowest ionization potential ?

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  5. In the nuclear fusion reaction (1)^(2)H + (1)^(3)H rarr (2)^(4)He + ...

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  6. The binding energy per nucleon of deuterium and helium atom is 1.1 MeV...

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  7. If radius of the (13)^(27) Al necleus is estimated to be 3.6 fermi the...

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  8. Starting with a sample of pure .^66 Cu, 7//8 of it decays into Zn in 1...

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  9. Some radioactive nucleus may emit.

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  10. Which of the following is a correct statement?

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  11. .^22 Ne nucleus after absorbing energy decays into two alpha-particles...

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

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  13. The binding energy per nucleon of O^16 is 7.97 MeV and that of O^17 is...

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  14. A star initially has 10^40 deuterons. It produces energy via the proce...

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  15. A nucleus with mass number 220 initially at rest emits an alpha-partic...

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  16. The half life of radioactive Radon is 3.8 days . The time at the end o...

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

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  18. A radioactive material decays by simulataneous emission of two particl...

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

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  20. Two radioactive X(1) and X(2) have decay constants 10 lambda and lamb...

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  21. After 280 days, the activity of a radioactive sample is 6000 dps. The ...

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