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Building on Planck’s Quantum Theory Foundation on Planck: Einstein’s theory is based on Planck’s idea that energy is quantised. Foundation on Planck: Einstein’s theory began by building upon the earlier ideas introduced by a scientist named Max Planck. Planck had proposed that energy isn’t released smoothly and continuously, but instead in very tiny and separate … Read more
Definition Effect overview: Electrons are emitted from a metal surface when exposed to light of sufficiently high frequency. Effect overview: When certain types of light shine on a metal surface, tiny particles called electrons can jump out from the surface. This only happens if the light has a high enough frequency or energy. Photoelectrons: The … Read more
Background Classical particle view: Light was originally thought to consist of tiny particles. Classical particle view: A long time ago, scientists believed that light was made up of very small particles, kind of like tiny balls, that travel through empty space. They thought these particles could explain how light moved and how we could see … Read more
Transistor Basic definition: A transistor is a semiconductor device that functions as a switch or amplifier for electrical signals. Basic definition: A transistor is a small electronic component made from semiconductor materials. It can act as a switch to turn electricity on or off or as an amplifier to make electrical signals stronger. Transistors are … Read more
Definition Spontaneous process: Radioactive decay is a natural event where unstable atomic nuclei emit radiation to become stable. Spontaneous process: Radioactive decay is a natural process that happens on its own without being started by anything outside. It occurs when the nucleus (center) of an unstable atom breaks down and gives off radiation so it … Read more
Definition Nuclear energy source: Energy released from the atomic nucleus during nuclear reactions. Nuclear energy source: Nuclear energy comes from a special place inside every atom called the nucleus. This is the center of the atom, where protons and neutrons are found. When a nuclear reaction happens—meaning there is a big change in the nucleus—a … Read more
Electron Atomic structure: Atoms are made up of protons, neutrons, and electrons. Atomic structure: Atoms are tiny particles that make up everything around us. Each atom is made of three main parts: protons, neutrons, and electrons. These parts are called subatomic particles because they are smaller than atoms. Electron characteristics: Electrons are the lightest subatomic … Read more
Semiconductor Diode Basic definition: A semiconductor diode is an electronic device that allows current to flow in only one direction. Basic definition: A semiconductor diode is a small electronic component that controls the direction of current flow. It is specially made so that electric current can move through it in only one direction, just like … Read more
Electromagnetic Induction Definition of induction: Electromagnetic induction is the process of generating e.m.f. (voltage) in a conductor exposed to a changing magnetic field. Definition of induction: Electromagnetic induction is the process where a voltage—also known as electromotive force (e.m.f.)—is created in a wire or conductor. This happens when the wire is placed in a magnetic … Read more
Transformer Structure Basic function: A transformer uses electromagnetic induction to increase (step-up) or decrease (step-down) AC voltage. Basic function: A transformer is a special electrical device that uses a process called electromagnetic induction to change the voltage of alternating current (AC). It can either increase the voltage (this is called a step-up transformer) or decrease … Read more