A strip of Na metal is bombarded by violet light (wavelength = 410 nm) at a rate of 10,000 photons per second, which causes a steady stream of electrons to be ejected from the metal via the photoelectric effect. The minimum energy required to eject an electron from Na is 4.41 x 10−19 J. What will happen if the Na is now bombarded with red light (wavelength = 700 nm) at a rate of 10,000 photons/second?

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *

Which statement names the physical property of wood a. wood is softer than coal b. wood does not rust c. wood can rot d. wood can burn

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.