Which observation led scientists to describe matter as behaving like a wave a. counts of the number of atoms in a sample b. electrons flowing from a metal using certain types of light c. electrons forming interference patterns d. excited atoms giving off light of specific frequencies

Observations of electrons forming interference patterns led scientists to describe matter as behaving like a wave . (Choice-C). Up to that time, it was believed that only waves can form interference patters.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.