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user https://youtu.be/oTjdHbwJDbM lum·bered v. /ˈlʌmbərd/ [ Using. ] ( informal ) moved in a slow, heavy, awkward way （笨拙而沉重地移动）[使用场景:] 常用于描写人或动物动作迟缓、笨拙，带有不灵巧或累赘的意味。 SYN: trudged, stumbled, plodded, shuffled He lumbered across the room and collapsed into the chair.他笨重地走过房间，扑通一声倒在椅子上。 The bear lumbered through the forest, shaking the ground with each step.那头熊笨拙地走过森林，每一步都震动着地面。 She lumbered up the stairs, carrying the heavy suitcase.她拎着沉重的手提箱，笨拙地走上楼梯。 … Read more
Berikut adalah asas pembentukan ikatan: Unsur-unsur berlainan yang berikat secara ikatan kimia dipanggil sebatian. Atom-atom membentuk ikatan kimia untuk mencapai susunan elektron yang stabil. Kestabilan dicapai apabila atom mempunyai susunan elektron duplet (2 elektron valens seperti helium) atau oktet (8 elektron valens seperti gas adi lain). Atom selain gas adi cenderung mencapai susunan stabil ini … Read more
Solubility of Salts Solubility of Salts Solubility is the ability of a compound to dissolve in a solvent. Table below shows the solubility of the salts of nitrate, sulphate, chloride and carbonate. Salt Solubility Salt of potassium, sodium and ammonium All soluble in water Salt of nitrate All soluble in water Salt of sulphate Mostly … Read more
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