Answer:
There are chlorophyll a and chlorophyll b. in chlorophyll a there is more energy required than in chlorophyll b. chlorophyll a have an absorption peak at 700 nm in contrast to the 680nm of chlorophyll b. chlorophyll a creates a more greener pigment whereas the chlorophyll b has a more yellow appearance of leaves in the fall. there are also other pigments like carotenes which produce the red in autumn.