When an atom is split in half, a process known as nuclear fission, it does not produce a distinct sound that can be directly perceived by our ears. The splitting of an atom releases an immense amount of energy in the form of heat and radiation, but sound is a vibration that travels through a medium such as air, water, or solids. Since the process of nuclear fission occurs at the atomic level, in the nucleus of an atom, there is no medium for sound waves to propagate.
However, it's worth noting that during a nuclear fission event, there might be secondary effects that can produce sounds indirectly. For example, if the fission occurs in a material, such as metal or concrete, the release of energy can cause vibrations in the surrounding medium, which might be audible as sound waves. Additionally, the intense release of energy during a nuclear fission reaction can lead to explosive effects, such as shockwaves or sonic booms, which generate sound waves in the surrounding air.
Nevertheless, the primary process of an atom being split in half does not produce a characteristic sound on its own. It is mainly associated with the release of energy in other forms, such as heat, light, and radiation.