Which of the following is a basic type of explosion?

The option identified as correct refers to nuclear explosions, which represent a basic category of explosions characterized by the release of energy through nuclear reactions. Such explosions can result from either the fission of heavy atomic nuclei or the fusion of light nuclei, leading to immense releases of energy and producing both immediate destructive forces and long-lasting effects, such as radiation.

Nuclear explosions are distinct from other types of explosions due to their underlying mechanisms and consequences. They typically generate shock waves, intense heat, and radiation, which can have far-reaching environmental and health impacts. Understanding nuclear explosions is essential for fire investigators as they may encounter various scenarios involving hazardous materials, including radioactive substances.

Other types of explosions such as biochemical, electrical, and thermal involve different processes. Biochemical explosions are associated with chemical reactions of biological agents, electrical explosions arise from electrical faults or surges, and thermal explosions are related to rapid heat generation due to combustion or other thermal processes. While these are also types of explosions, they do not classify as the primary or fundamental categories when compared to nuclear explosions, which stand out because of their distinct nature and effects.