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Q: What is the distance between a line through the middle of a wave and a crest or trough called?
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What is the difference between the oval window and the round window?

the oval window- an oval opening between the middle ear and the vestibule having the base of the stapes or columella attached to its membrane -- called also fenestra ovalis, fenestra vestibuli the round window: a round opening between the middle ear and the cochlea that is closed over by a membrane -- called also fenestra cochleae, fenestra rotunda


What is the Muller-lyre illusion?

it is an optical illusion consisting of lines and arrows, a larger version of <-->--< where the dashes should be joined. The idea is that the distance between the first and middle arrows above looks shorter than the middle and third arrow. For a larger Muller-Lyre see www.csus.edu/.../psyc103/MullerLyre.jpg


What is the middle of the tornado called?

It is called the eye of the tornadoAn eye


What is the difference between wavelength and amplitude?

Wavelength - the distance from one wave crest or trough to another wave crest or trough.Amplitude - the distance from the median point or "middle" of the wave straight up to a crest (a maximum) or straight down to a trough (or minimum), which is the peak amplitude; or the distance from a trough straight up to a crest, or a crest straight down to a trough, called peak-to-peak amplitude. A more general definition for amplitude might be the "height" of the wave. Note that wavelength is a function of the frequency of a given wave or "signal" and the speed at which that wave travels. One way to look at things is to throw a rock into a pond and create a wave. The wave would travel outward from the point where the rock struck the water, as you may have guessed. Picture the wave forming in slow motion. As the wave was going through its complete cycle, the wave would be moving away from the point of origin. As the wave goes through one complete cycle, the wave is still moving away. And by the time one complete cycle has occurred, we have only to measure the distance that, say, a crest traveled back to the next crest to determine the wavelength. Think it through and it will lock in.


What is a lens called if it is thicker in the middle than at the edges?

It is called a convex lens.