How many things do controlled experiments attempt to test at one time? 0 1 3 2

How many miles of water are produced if 5.43 mol pbo2 are consumed

How does the motion of particles in a gas change as the gas cools

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.