Why was plastic first invented? How is plastic bad for the environment?​

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~

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.