17 A bar of metal, which is a good thermal conductor, is heated at one end. What is the main method of transfer of thermal energy along the bar?A latice vibrationB movement of atoms of the metal along the barC transfer by electronsD vibration of atoms of the metal bar 相关知识点: ...
A conductor, or electrical conductor, is a substance or material that allows electricity to flow through it. In a conductor, electrical charge carriers, usuallyelectronsor charged ions, move easily from atom to atom whenvoltageis applied. Most metals like copper are considered good conductors, whil...
Semiconductors are typically made of silicon, which can become a good conductor of electricity when it’s processed. Silicon is also very stable, which means it can withstand high temperatures. And silicon is abundant: It accounts for about 28 percent of the Earth’s crust. ...
In general, metals are shiny, reflecting most of the light that strikes them. They are malleable and ductile (that is, they will bend under pressure and are not brittle). They have a broad range of melting temperatures (e.g., mercury is a liquid at room temperature, gallium will melt i...
If air is a poor thermal conductor, why doesn't it keep you warm in the winter? Which type of material (conductor or insulator) you would want to use in the following cases and provide an explanation? You need to move a live power line out of a puddle of water. There is a lot of...
What is super insulation? The flow of electrons in a conductor is called ___. Good thermal conductors are also good electrical conductors. If so, why don't the connecting wires that are used to connect heaters get hot by conduction of heat from the heating element? Which of...
3.Corrosion resistance:Diamond is immune to strong acids, bases, and even organic solvents. 4.Electrical conductivity: Diamond does not conduct electricity and is a very good insulator. 5.Durability:Diamond is one of the hardest materials known. ...
Aluminum is a good thermal and electrical conductor. It is a lightweight metal, having about one-third the density and stiffness of steel. It is ductile and malleable, which means it can be easily machined, cast, and extruded. Under normal circumstances, aluminiumis not soluble in water or ...
Semiconductors are a material with properties that fall between a good conductor (like metals) and a good insulator (like rubber). Depending on the conditions, semiconductors can be conductive or insulating. This ability to control the flow of electrical current in modern electrical devices, such ...
The earth is a pretty good conductor and it is huge, so it makes a good return path for electrons. (Car manufacturers do something similar; they use the metal body of the car as one of the wires in the car's electrical system and attach the negative pole of the battery to the car'...