What is the cobalt-57 decay reaction

Which statement can best be concluded from the ideal gas law?

Tell me the iupac name of the following compounds:

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.