What unit is used to describe distance or length?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Which statement best describes the flow of energy in this scenario