With what equation and what numbers to plug in, i can do the rest.
the retina of a human eye can detect light when radiant energy incident on it is at least 4.0 x 10^-17 j. for light of 565 nm wavelength , how many photons does this energy correspond to?

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of