1. Interact with matter:
* Photoelectric effect: When light strikes a metal surface, it can eject electrons. This effect can only be explained by assuming that light is made of discrete packets of energy called photons. The energy of a photon is directly proportional to the frequency of the light.
* Compton scattering: When light interacts with an electron, it can change direction and lose energy. This phenomenon can only be explained by assuming that light interacts as a particle with the electron.
2. Exhibit wave-particle duality:
* Diffraction and interference: Light can exhibit wave-like behavior, such as diffraction (bending around corners) and interference (producing patterns of light and dark). These phenomena can be explained by the wave nature of light.
* Photoelectric effect and Compton scattering: These phenomena demonstrate the particle-like nature of light, as described above.
3. Be quantized:
* Blackbody radiation: The energy emitted by a hot object is not continuous but rather occurs in discrete packets of energy, which can only be explained by the quantized nature of light.
* Spectroscopy: The emission and absorption of light by atoms is specific to certain wavelengths, suggesting that light energy is quantized.
In summary, the particle model of light explains the interaction of light with matter, its wave-particle duality, and its quantized nature. This model is crucial for understanding a wide range of phenomena in physics and chemistry.
