In quantum mechanics, the wave function represents the probability amplitude of a particle, providing information about the likelihood of finding a particle in a particular state.

When light of frequency greater than the threshold frequency strikes a metal surface, it provides enough energy to eject electrons from the surface.

The de Broglie wavelength of a particle is given by the formula λ = h/p, where h is Planck's constant and p is the momentum of the particle.

Increasing the frequency of light above the threshold frequency increases the photoelectric current, as more electrons are emitted with higher energy.

A semiconductor laser operates on the principle of stimulated emission, where photons stimulate the emission of more photons, leading to coherent light.

The relationship between frequency and wavelength in a wave is described by the equation Speed = Frequency x Wavelength, which holds true for all types of waves.

Interference occurs when waves overlap and combine to form a new wave, resulting in regions of constructive and destructive interference.

All of the above phenomena demonstrate the wave-particle duality of light, showing that light exhibits both wave-like and particle-like properties.