Which experiment proved light was a wave? A) Photoelectric effect
B) Double Slit
C) Compton Scattering
D Light was never proved to be a wave

Which two particles are found in the center of an atom

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?

What was the first instrument to ever record an earthquake?