The force of attraction between helium atoms is the London dispersion force.
Helium is a non-polar noble gas, so the only force of attraction between its atoms is the weak London dispersion force, which arises from temporary fluctuations in electron distribution.
The photoelectric effect best explains the particle nature of light.
The photoelectric effect is a phenomenon where electrons are ejected from a metal surface when exposed to light of a specific frequency. This can only be explained by considering light as composed of discrete particles called photons, each carrying a specific amount of energy. When a photon interacts with an electron in the metal, it transfers its energy to the electron, allowing it to escape the surface.
The direction of a vector in space is typically specified by three angles.
These angles, often referred to as azimuth, elevation, and tilt (or polar/inclination), describe the vector's orientation in 3D space relative to a chosen reference frame.
