Humans have three types of cone cells in their eyes, which are responsible for color vision. each type absorbs a certain part of the visible spectrum. suppose a particular cone cell absorbs light with a wavelength of 430. nm . calculate the frequency of this light. round your answer to 3 significant digits.

Plz choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. is it possible for two different compounds to be made from the exact same two elements? why or why not? with a limited number of elements (less than 120 are known), does this mean we also have a small number of compounds or do we have a large number of compounds in this world?

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy