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Consider the following statements: (i) Nuclear fission is normally followed by emission of `beta`-particles. (ii) Emission of `alpha`-particle is normally followed by emission of `gamma` rays. (iii) In carbon-carbon cycle of fusion reaction which powers the large starts, two carbon nuclei combine to form a magnesium nucleus: The correct order of True/False in above statements isA. TTTB. TTFC. FTTD. TFT |
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Answer» (i) Nuclear fission results in fragments whose neutron/proton ratio is higher than the required value (N/P ratios is greater for heavier nuclei). To reduce the N/P ratio these fragments undergo `beta^(-)` decays in which a neutron is converted into a proton. (ii) Some of the energy generated in `alpha`-emission goes into nuclear excitation. the excited nucleus returns to ground state by `gamma`-emission. (iii) in carbon -carbon cycle `.^(12)C` nucleus acts just as a catalust. the net result is fusion of four protons into a healium nucleus. |
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