Why is atmospheric pressure much lower on the top of a mountain than it is as sea level?

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

Why does asexual reproduction result in offspring with identicle genetic variation

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.