Which if the following has a charge A. molecule B. atom C. element D. ion

Nonpoint source pollution is difficult to control because it

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.

What is the energy in joules of a mole of photons associated with visible light of wavelength 486 nm?