# Determine the energy released in the process: $${}_{1}^{2}\mathrm{H}+ {}_{1}^{2}\mathrm{H}\rightarrow {}_{2}^{4}\mathrm{He}+Q$$ Given: $$M\left({}_{1}^{2}\mathrm{H}\right)= 2.01471~\text{amu}, M\left({}_{2}^{4}\mathrm{He}\right)= 4.00388~\text{amu}$$ 1. $$3.79$$ MeV 2. $$13.79$$ MeV 3. $$0.79$$ MeV  4. $$23.79$$ MeV

Subtopic:  Mass-Energy Equivalent |
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When $${}_{3}^{7}\mathrm{Li}$$ nuclei are bombarded by protons, and the resultant nuclei are $${}_{4}^{8}\mathrm{Be}$$ the emitted particles will be:
 1 Neutrons 2 Alpha particles 3 Beta particles 4 Gamma photons
Subtopic:  Types of Decay |
52%
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If $$\frac{N}{Z}$$ ratio in a nucleus is smaller than the required value for stability, then:
 1 It may emit $$\alpha\text-$$particle. 2 It may emit $$\beta^{+}$$ particle. 3 It may go for $$K$$ capture. 4 All of the above are possible.
Subtopic:  Types of Decay |
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What is the respective number of $$\alpha$$ and $$\beta\text-$$ particles emitted in the following radioactive decay?
$${}_{90}^{200}\mathrm{X}\rightarrow {}_{80}^{168}\mathrm{Y}$$
 1 $$6$$ and $$8$$ 2 $$6$$ and $$6$$ 3 $$8$$ and $$8$$ 4 $$8$$ and $$6$$
Subtopic:  Types of Decay |
84%
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If a proton and anti-proton come close to each other and annihilate, how much energy will be released?

 1 $$1.5 \times10^{-10}~\text{J}$$ 2 $$3 \times10^{-10}~\text{J}$$ 3 $$4.5 \times10^{-10}~\text{J}$$ 4 None of these
Subtopic:  Mass-Energy Equivalent |
54%
From NCERT
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The nucleus $${ }_{6}^{12} \mathrm{C}$$ absorbs an energetic neutron and emits $$\beta\text-$$particle. The resulting nucleus is:
 1 $${ }_{7}^{14} \mathrm{N}$$ 2 $${ }_{5}^{13} \mathrm{B}$$ 3 $${ }_{7}^{13} \mathrm{N}$$ 4 $${ }_{6}^{13} \mathrm{C}$$
Subtopic:  Types of Decay |
64%
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Fusion reaction takes place at a higher temperature because:

 1 atoms get ionized at high temperatures. 2 kinetic energy is high enough to overcome the Coulomb repulsion between nuclei. 3 molecules break up at a high temperature. 4 nuclei break up at a high temperature.
Subtopic:  Nuclear Energy |
81%
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NEET - 2011
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Which of the following pairs of nuclei are isotones?
 1 $${}_{34}^{74}\mathrm{Se}, {}_{31}^{71}\mathrm{Ca}$$ 2 $${}_{42}^{92}\mathrm{Mo}, {}_{40}^{92}\mathrm{Zr}$$ 3 $${}_{38}^{81}\mathrm{Sr}, {}_{38}^{86}\mathrm{Sr}$$ 4 $${}_{20}^{40}\mathrm{Ca}, {}_{16}^{32}\mathrm{S}$$
Subtopic:  Nuclear Binding Energy |
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If in nuclear reactor using $$\mathrm{U}^{235}$$ as fuel, the power output is $$4.8$$ MW, the number of fissions per second is:
(Energy released per fission of $$\mathrm{U}^{235}=200$$ MeV watts, $$1~\text{eV}= 1.6\times 10^{-19}~\text{J})$$

 1 $$1.5\times 10^{17}$$ 2 $$3\times 10^{19}$$ 3 $$1.5\times 10^{25}$$ 4 $$3\times 10^{25}$$
Subtopic:  Nuclear Energy |
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Calculate the $$Q\text-$$value of the nuclear reaction:
$$2~{ }_{6}^{12} \mathrm{C}\rightarrow{ }_{10}^{20} \mathrm{Ne}+{ }_2^4 \mathrm{He}$$
The following data are given:
$$m({ }_{6}^{12} \mathrm{C})=12.000000~\text{amu}$$
$$m({ }_{10}^{20} \mathrm{Ne})=19.992439~\text{amu}$$
$$m({ }_{2}^{4} \mathrm{He})=4.002603~\text{amu}$$
1. $$3.16~\text{MeV}$$
2. $$5.25~\text{MeV}$$
3. $$3.91~\text{MeV}$$
4. $$4.65~\text{MeV}$$

Subtopic:  Mass-Energy Equivalent |
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