The actions described in the passage are best understood in the context of which of the following? A) the introduction of chariots to china
B) the reliance of government on surplus agriculture
C) the importance of trade along the silk road
D) the need of rulers to maintain social hierarchies

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.