Question

Why is high temperature required for Nuclear fusion?
A. All nuclear reactions absorb heat
B. The particles can not come together unless they are moving rapidly
C. The binding energy must be supplied from an external source
D. The mass defect must be supplied

Answer 1

Hint: We studied that there are two types of nuclear reactions taking place between the atoms of elements, these are nuclear fusion and nuclear fission. We can solve this problem with the help of the concept of nuclear fusion. In the both processes nuclear fission and nuclear fusion, atoms are altered to form new energy.

Complete answer:
Fusion means combination of two atoms into a larger one and fission means division of a large atom into two atoms. Nuclear fusion defines the union of lighter nuclei to form a heavier nuclei resulting in the release of enormous amounts of energy. Fusion occurs when two lighter mass isotopes, unite under extreme conditions of pressure and temperature. The power of the Sun is based on the nuclear fusion reaction. Amount of the energy released in the fusion is several times the amount produced from fission.
In the nuclear fusion mass defect occurs which is responsible for energy release. It occurs when the total mass of the product is less than the mass of the initial reactants. For example, hydrogen atoms come together to form helium atoms, neutrons and large amounts of energy .

In nuclear fusion, atoms of the same nature repels each other so it is very hard to unit them. If the temperature is high then their kinetic energy increases and they move with high speed which is helpful to overcome the repulsion between them and can unite together.

So, the correct answer is “Option B”.

Note:
We know from the above discussion that higher temperature is required to unite the nuclei together and overcome the repulsion between them. Nuclear reaction is caused behind the light of the stars and the Sun.