Which of the following most affects the wavelength of a mechanical wave moving through a medium? assume that the frequency of the wave remains constant. a. the nature of the medium c. the height of a crest b. the amplitude d. the energy carried by the wave

When an object is heated it contracts. a. true b. false

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

What can you increase the strength of an electromagnet by