German physicist Werner Heisenberg related the uncertainty of an object's position (Δ) to the uncertainty in its velocity (Δ) Δ≥ℎ4Δ

where ℎ is Planck's constant and is the mass of the object.

The mass of an electron is 9.11×10−31 kg.

What is the uncertainty in the position of an electron moving at 5.00×106 m/s with an uncertainty of Δ=0.01×106 m/s?

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.