The crests of waves passing into a harbor are 2.1 m apart and have an amplitude of 60 cm. 12 waves
pass an observer every minute. What is the frequency of these water waves?

ok

explanation:

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

the answer is 100. i just did this lesson and got a 100% on it. : )

-fishtank