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The source of unlimited thermal energy o...

The source of unlimited thermal energy of stars is due to

A

nuclear fission

B

photo disintegration

C

nuclear fusion

D

`gamma`-ray disintegration

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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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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2007-PHYSICS
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