Question

Sun produces heat and light by:
A.Combustion
B.Inflammation
C.Nuclear reactions
D.Photochemical reactions

Answer 1

We have to know that in fusion reactions at least two atomic nuclei combine (or) fuse to a single nucleus. Subatomic particles like neutrons or protons are also formed as products in these nuclear reactions.

Complete step by step answer:
We have to know that nuclear reactions are processes in which one or more nuclides are formed as the result of the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle. The nuclides formed from nuclear reactions are different from the reacting nuclei (or) the parent nuclei.
We can say that there are two types of nuclear reactions:
Nuclear fission:
Nuclear fission is the reaction that occurs when the nucleus of an atom splits into two smaller nuclides having similar masses during fission process energy is released.
Nuclear fusion:
Nuclear fusion is the process of producing a single heavy nucleus from two lighter nuclei. It liberates a large amount of energy. This energy powers the heat and light to the stars. Fusion happens in the middle of stars.
The reaction that takes place in the sun is a nuclear fusion reaction.
The light and heat energy from the Sun comes from a nuclear fusion process that occurs inside the core of the Sun. The specific type of fusion, which takes place inside the Sun, is known as proton-proton fusion.
Inside the Sun, this process starts with protons and through a series of reactions, these protons combine together and form into helium. This fusion process takes place inside the core of the Sun, and the transformation leads to release of energy which keeps the sun hot. The rest of the Sun is heated by energy transferred outward from the core.
Therefore, option (C) is correct.
A reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat is called a combustion reaction. Combustion reactions should involve oxygen $\left( {{O_2}} \right)$ as one reactant.
Therefore, option (A) is incorrect.
Inflammation reaction is a biological process, and not a chemical reaction. Option (B) is incorrect.
A chemical reaction, which begins with light being absorbed as energy is called a photochemical reaction. An example of a photochemical process is photosynthesis.Therefore, the option (D) is incorrect.

So, the correct answer is Option C.

Note:
We have to know that nuclear reactions are referred to externally induced changes, which are brought on to atomic nuclei. We have to know that there are some processes that cannot be considered as nuclear reactions.
Nuclear scattering processes are processes, which involve the collision and subsequent separation of atomic nuclei without any changes in the nuclear composition. In these processes, only momentum and energy are transferred.
A process through which an unstable nucleus emits radiation in order to lose energy is known as nuclear decay.
Spontaneous fission reactions are types of nuclear fission reactions that do not need a neutron to progress and are, therefore, not induced.
All these processes are similar to nuclear reactions, but they are not induced i.e. they occur spontaneous.