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.

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.

Solve Study Textbooks Guides

Join / Login

>>Class 12
>>Physics
>>Nuclei
>> $Nuclear fusion - Energy Generation in Stars$

Nuclear fusion – Energy Generation in Stars

Revise with Concepts

Nuclear Fusion (Phy)

ExampleDefinitionsFormulaes

Controlled Thermonuclear Fusion

ExampleDefinitionsFormulaes

Nuclear Holocaust

ExampleDefinitionsFormulaes

Learn with Videos

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: 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: 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: Fusion reaction takes place at very high temperature because

Fusion reactions takes place at temperature about \$10^7K\$ it requires this high temperature so that nucleus are moving at very high speed, so that they have high kinetic energy and can overcome the repulsion between nuclei and come together.

Q: For a nuclear fusion process, suitable nuclei are

The process in which two or more light, nuclei are combined into a single nucleus with the release of tremendous amount of energy is called as nuclear fusionHence light nuclei are suitable for the nuclear fusion process

Q: Which of the following statement best describe Nuclear fusion reaction ?

When two or smaller nuclei combine to form a bigger nucleus, then the reaction is known as nuclear fusion reaction. A huge amount of energy is released in such reactions.

Q: Fusion processes, like combining two deuterons to form a \$He\$ nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact:

Two deuteron can combine to form \$He\$ atom when their nuclei come close to nuclear range where electrostatic repulsive force between positively charged deuterons does not act. The electrostatic force increases very high on decreasing their distance.\$\left( \because F\propto \cfrac { 1 }{ { r }^{ 2 } } \right) \$To overcome this electrostatic repulsive force nuclei need very high temperature and pressure. Hence to combine two nuclei, they must reach closer of the range of where nuclear force acts and electrostatic repulsive force does not act verifies the answer (a) and (b)