A doctor uses an instrument(s) that emits light and allows the doctor to view the inside of a patient’s intestine. What is the doctor most likely using?

a telescope
a microscope
laser beams
fiber optics

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.

Draw two cyclic constitutional isomers of cis-1

Which of the following is not true about the atomic model of substances?