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In the previous entry , we said that light is a WAVE based on its characteristics of showing wave phenomena. Knowing that, light is also a PARTICLE. Later in this writing, we will figure out how light can be also concluded as a particle. Photoelectric Effect Photoelectric Effect is the emission of electrons (called photoelectrons) from a metal surface when an incident light strikes the surface with enough energy/frequency. The photoelectric effect is represented by the Einstein's Photoelectric Effect equation: This equations consists of 3 terms which represent 3 items in the figure above that are , E is for the incident light , Wo is for the Metal and Kmax is for the Photoelectrons. The incident light energy must be bigger than the work function of the metal . Work function is basically the energy possessed by the electrons in the metal. Hence, to free these electrons from the metal , the incident light must have enough energy to displace the electrons. The incid

Light Phenomena Knowing that, Light can only be 'said' as light if it is able to undergoes a few phenomena and these are i) Reflection ii) Refraction iii) Diffraction iv) Intereference Light is actually a wave. That is why it could do what a wave does. In Malaysia Matriculation syllabus, Reflection and refraction are discussed separately from diffraction and interference. The first two are in Geometrical Optics chapter while the other two are in chapter Physical Optics. Geometrical optics deals more with ray diagram, few parameters like focal length, radius and so on, and that is how it relates with the word 'geometric'. Thank you, Mdm Ummi Atiah KMPk ~  May it Benefits You ➽💕