You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. the nitrate is reduced to nitrogen gas. you can be sure that this bacterium is

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.