Very confused! the way in which a wave behaves when it reaches the end of the medium through which it was traveling is often called boundary behavior. the boundary behavior of light waves is best summarized by the following statements: the wavelength is always longest in the least optically dense medium. the frequency of a wave is not altered by crossing a boundary. the amplitude of an original pulse is always greater than the amplitude of a reflected pulse. given the above information, and given that solids generally have greater optical densities than liquids, and that liquids generally have greater optical densities than gases, which of the following statements is true? the number of wavelengths per unit time will change as a light wave moves from a solid into a liquid. the wavelength of a light wave will increase as it moves from a gas into a liquid. the wavelength of a light wave will increase as it moves from a liquid into a solid. the number of wavelengths per unit time will not change as a light wave moves from a solid into a liquid.

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance