![In a radioactive substance at t =0, the number of atoms is 8×104, its half-life period is 3 yr. the number of atoms 1 x 10 will remain after interval (a) 9 yr (c) 6 yr [UP CPMT 2010] (b) 8 yr (d) 24 yr](https://s3.ap-south-1.amazonaws.com/neetprep.com/NRV - NUCLEI /Ques020.png)
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![what is the respective number of α and β-particles emitted in the following radioactive decay 200 168 > (b) 6 and6 (d) 8 and 6 90 80 o'[1995] (a) 6 and8 (c) 8 and 8](https://s3.ap-south-1.amazonaws.com/neetprep.com/NRV - NUCLEI /Ques099.png)
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![The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit) The binding energy of 2He4 is (mass of helium nucleus = 4.0015 u) (a) 28.4 Mev (c) 0.0305J [2003] (b) 0.061 u (d) 0.0305 erg](https://s3.ap-south-1.amazonaws.com/neetprep.com/NRV - NUCLEI /Ques069.png)
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![A free neutron decays into a proton, an electron and (a) a beta particle (c) an antineutrino(d) a neutrino [1997] (b) an alpha particle](https://s3.ap-south-1.amazonaws.com/neetprep.com/NRV - NUCLEI /Ques092.png)
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![The energy equivalent of one atomic mass unit is (a) 1.6 × 10-19 J (c) 931 Mev [1992] 23 (d) 9.31 Mev](https://s3.ap-south-1.amazonaws.com/neetprep.com/NRV - NUCLEI /Ques107.png)
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Solar energy is due to
1. fusion reaction
2. fission reaction
3. combustion reaction
4. chemical reaction
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