Compression is to crest as rarefaction is to

a. peak
b. trough
c. amplitude
d. wavelength

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

What are the applications of electromagnetic waves

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90