Kai was 200 meters north of the library when he remembered he had to return some books to the library .it took him seconds to do the round trip. which best describes kais rountrip

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.