For years, marine scientist were mystified by sound waves detected by underwater microphones in the pacific ocean. these so-called t waves were among the purest sounds in nature. eventually the researchers traced the source to underwater volcanoes whose rising columns of bubbles resonated like organ pipes. a typical t wave has a frequency of 6.8 hz. knowing that the speed of sound in seawaver is 1,530 m/s, determine the wavelength of a t wave.

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

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

What is the moment of inertia i of this assembly about the axis through which it is pivoted? express the moment of inertia in terms of mr