Please help (CHEMISTRY) preferably help on both but even one would be great :D the radio wave broadcast on the am dial has a wavelength of 280.4m. find the frequency of this radio wave in hertz. convert the frequency to kilohertz.

the frequency of light used to hear food in a microwave oven is 2.45 ghz (2.45x10^91/s). What is the wavelength of this light

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.