核裂变

• 木(tree; wood)RADICAL
• 亥(pig (12th zodiac sign))PHONETIC

The kernel of a tree fruit (木) sounds like the character for pig (亥).

• 列(row; line up)PHONETIC
• 衣(garment; cloth)RADICAL

Cloth from clothing torn into strips arranged in rows shows how things split apart.

• 亦(also; add to)ASSOCIATIVE
• 又(right hand; again)RADICAL

A hand with added force impacts things and transforms them.