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Nuclear Physics and Laser


19. 

Control rods used in nuclear reactor are made of

Answer : C. Cadmium

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20. 

Electrons are accelerated to very high energies by means of

Answer : D. Betatrons

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21. 

Consider the following statements:
In a molecular reactor, self-sustained chain reaction is possible , because,
1. more neutrons are released in each of the fission reactions.
2. the neutrons immedietely take part in the fission process.
3. fast neutrons are slowed fdown by graphite.
4. every neutron released in the fission reaction initiates further fission
Which of the statements are correct

Answer : A. 1,2 and 3

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22. 

Beta Particle is

Answer : C. negatively charged particles

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23. 

Beta particles are

Answer : C. electrons

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24. 

Charge of an electron is

Answer : C. 1.6 x 10-19coulomb

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