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The equation of a nuclear fusion: 4 pro...

The equation of a nuclear fusion: 4 protons `to` X +2 positrons .What is the mass number of X ?

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In has been estimated that the total energy radiated by the sun is 3.8xx10^26 J per second. The source of energy of stars is a thermonuclear reaction called nuclear fusion. Fusion reactions are not controlled. It is presumed that the energy of stars is due to two processes called proton-proton cycle and carbon nitrogen cycle. Fusion cannot take place at ordinary temperature. This, hydrogen bomb uses a small fission bomb, which on explosion causes the temperature to rise very high about 10^7 K. We have yet to see how a hydrogen bomb can be used for peaceful life-sustaining purpose. Energy released in the process of fusion is due to mass defect. It is also called Q-value. Q =Deltamc^2 , Deltam= mass defect Answer the following questions based on above passage: Fusion reaction takes place at about:

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What will be the change in the ratio of neutrons to protons of a nucleus if (i) a beta -particle is emitted, (ii) a positron is emitted and (iii) a gamma -ray photon is emitted?

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  1. Statement I: No natural radioisotope can emit positron. Statement II: ...

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  2. Statement 1: The greater the decay constant of a radioactive element, ...

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  3. A radioactive isotope X^A becomes Y^(A-4) after decay. Which of the fo...

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  4. A radioactive isotope X^A becomes Y^A after disintegration which of th...

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  5. In case of a radioactive element which of the following relations are ...

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  6. When alpha-rays and beta-rays are compared as radioactive radiation, i...

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  7. Ratio of mass number of two nuclei is 1:8, then - (A) ratio of diamet...

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  8. In any nuclear reaction - (A) The total number of protons and neutron...

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  9. The initial number of radioactive atoms in a radioactive sample is N0....

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  10. The initial number of radioactive atoms in a radioactive sample is N0....

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  11. The initial number of radioactive atoms in a radioactive sample is N0....

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  12. The initial number of radioactive atoms in a radioactive sample is N0....

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  13. The initial number of radioactive atoms in a radioactive sample is N0....

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  14. What is the ratio of radius of aluminium-27 nucleus to that of a proto...

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  15. What is the value of k in the following nuclear reaction ? U^235 + n...

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  16. The half-life of iodine-131 is 8d. In how many days its activity will...

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  17. Radioisotope carbon-14 is a beta-emitter. What is the atomic number of...

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  18. The amount of radium in a radioactive sample is 16 g. What amount of r...

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  19. The equation of a nuclear fusion: 4 protons to X +2 positrons .What i...

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  20. The equation of a nuclear fusion : 2 deuteron to X +1 neutron What i...

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