The equation, \$ 4_1H^1 \rightarrow [ _2He^4]^{2+} + 2e^- ; + 26 MeV \$ represents :

According to the question, hydrogen is converted into helium and two position and energy. Here, this reaction corresponding fusion.

In nuclear reaction \$_{4}Be^{9}+_{2}He^{4} \rightarrow _{6}c^{12}\$+X, X will be :

\$_{4}Be^{9} + _{2}He^{4} \rightarrow _{6}C^{12} + X\$No. of protons are already balanced with \$C\$.\$\therefore\$ \$X\$ carries no charge.and \$ 9+4 > 12\$ by \$1\$ unit mass.\$\therefore\$ \$X\$ carries one unit mass.It's a neutron.

Areas where Jews lived were known as ghettos. Ghettos were often enclosed districts that isolated Jews by separating Jewish communities from the non-Jewish population and from other Jewish communities. Germans established at least 1,143 ghettos in the occupied eastern territories.

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>>Class 12
>>Physics
>>Nuclei
>>Nuclear fusion – Energy Generation in Stars
>> $Nuclear Reactions taking place in Sun an...$

Nuclear Reactions taking place in Sun and Nuclear Fusion

Q: The fission properties of \$^{239}_{94}Pu\$ are very similar to those of \$^{235}_{92}U\$. The average energy released per fission is 180 MeV. How much energy, in MeV, is released if all the atoms in 1 kg of pure \$^{239}_{94}Pu\$ undergo fission?

Number of atoms in 1 kg of pure Pu=\$\dfrac{6.023\times 10^{23}}{239}\times 1000=2.52\times 10^{24}\$As average energy released in fission is \$180 MeV\$, the total energy released is\$\Rightarrow2.52\times 10^{24}\times 180MeV\$\$\Rightarrow4.53\times 10^{26}MeV\$.

Q: Why high temperature is required for Nuclear fusion ?

Fusion reaction takes place at temperatures around \$10^7k\$. It requires this high temperature so that nucleus start moving at rapidly speed, which in turn increases their kinetic, so that they overcome the repulsion between them and can come together.

Q: The necessary condition for nuclear fusion is

High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons.High pressure - Pressure squeezes the hydrogen atoms together. They must be within \$1\times10^{-15}\$ meters of each other to fuse.

Q: The correct equation of nuclear fusion reaction is

In nuclear fusion reactions, the heavy isotopes of Hydrogen take part like deuterium \$_1H^2\$ and tritium \$_1H^3\$ as they have extra neutron. Therefore, the reaction C is correct out of the given options.

Q: The example of nuclear fusion is :

A helium nucleus is formed when \$4\$ hydrogen nuclei or protons come together. Thus, the example of nuclear fusion is formation of helium from hydrogen

Q: What is the source of energy in sun and stars ?

Nuclear fusion takes place in the sun and other stars.

Q: The binding energies of the atoms of elements \$P\$ and \$Q\$ are \$E_{p}\$ and \$E_{Q}\$, respectively. Three atoms of element \$Q\$ fuse to form one atom of element \$P\$. In this process, the energy released is \$e\$. The correct relation between \$E_{P}, E_{Q}\$ and \$e\$ will be

Binding energy of \$3\$ \$Q\$ elements will be \$3E_Q\$So, by energy conservation, binding energy of three \$P\$ elements is equal to the sum of \$Q\$ element's binding energy and the released energy.So, equation is \$E_p + e = 3E_Q \$\$E_p = 3E_Q - e \$