1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?2.What is the charge in coulombs on an object that has(1)An excess of 6.25×10^19 electrons?(2)An deficiency of 1.0×10^8 electrons? 答案 1.一个电子电荷e=-1.6...
However, light that hits the reverse side of each fringe does the opposite. Instead of moving upward and diverging, it moves downward and converges. It turns into a focused reproduction of the object — a real image that you can see if you put a screen in its path. The real image is ...
The drum, charged with static electricity, can attract the toner particles. There are three things about the drum and the toner that let a copier perform its magic: The drum can be selectively charged, so that only parts of it attract toner. In a copier, you make an "image" -- in ...
It's sort of like quantum physics' answer to the old Zen question: If a tree falls in the woods and no one is around to hear it, does it make a sound? Since the Copenhagen interpretation says that, when observed, an object is forced to take one state or another, the quantum ...
That URL will become a clickable link. Read on to learn some cleverer ways! How do you post a link on Facebook without showing the URL? You can hide a link in a clickable image, as explained in 1 – 3 below. But if you want to choose your anchor text and hide your website URL...
Nowadays, we've still got the leadoff man and the starting pitcher, but we've also got the relief pitcher -- who only comes into the game for an inning or two... the designated hitter -- who simply hits and does nothing else... and the set-up man -- who is likely to pitch to...
The main part of the machine (where the object is scanned) is contained within a sealed vacuum chamber because precise electron beams can't travel effectively through air. A positively charged electrode (anode) attracts the electrons and accelerates them into an energetic beam. An electromagnetic ...
How does an ion enter or exit a cell? Well, that’s whereion channelscome in. As the name implies, these are channels located in the membrane that grant passage to specific kinds of ions. (Note: In most cells, the potassium channels outnumber the sodium ones.) ...
But according to the menu, if you offer cheesy steak and mash potato, etc., which contain an outrageous amount of calories. Therefore, the problem with this restaurant is that name is quite confusing. The word“men’s”does raise a lot of confusion, such as referring to theyoung, middle...
If you’re an entrepreneur trying to establish business credit, you’ve probably heard terms like “tradelines, trade credit, corporate tradelines, or vendor accounts.” You may even know they are important, but aren’t sure how to get them and how they can benefit your business. We’ll...