Question

Solar energy is due to

• A. fusion reaction
• B. fission reaction
• C. combustion reaction
• D. chemical reaction

Hint:

Nuclear Fusion is a reaction in which two or more small nuclei combine together to form a large nucleus. It is generally called a nuclear process in which the energy is produced due to smashing of two or more small atoms.

Answer 1

The Correct Option is A

The question asks about the source of solar energy. To answer this, we need to understand the processes that occur within the sun to produce energy.

Solar energy is generated through nuclear fusion reactions that occur in the sun's core. Here's a step-by-step explanation:

1. The sun is primarily composed of hydrogen and helium. In its core, the temperature and pressure are extremely high.
2. Under such conditions, hydrogen nuclei (protons) move so rapidly that they overcome their natural repulsion and collide with enough force to merge into heavier elements, primarily helium.
3. This process of combining lighter atomic nuclei into heavier nuclei is called nuclear fusion.
4. Fusion reactions in the sun involve the conversion of four hydrogen nuclei into one helium nucleus, releasing a tremendous amount of energy in the form of light and heat, which we observe as solar energy.

Now, let's consider the other options:

• Fission reaction: This process involves splitting a heavy nucleus into smaller nuclei, which is how nuclear reactors on Earth generate power. This is not the energy source for the sun.
• Combustion reaction: This involves chemical reactions with oxygen, producing heat; typical examples are burning wood or fossil fuels. This is not sufficient to account for the sun's massive energy output.
• Chemical reaction: These are interactions between molecules or atoms that involve electrons rather than atomic nuclei. The sun's processes are much more energetic and involve nuclear changes rather than chemical ones.

Thus, the correct answer is indeed fusion reaction because it correctly describes the process that powers the sun.