Which of the following demonstrates the role of chemistry in getting ready for school in the morning?
A. Soap cleans dirt and grease from your skin.
B. Hot and cold water can be mixed together to make warm water.
C. A hairdryer blows hot air when it is turned on.
D. A mirror reflects light in a way that allows you to see your
reflection

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.