The size of a wave is measured as its wavelength, which is the distance between any two corresponding points on successive waves, usually peak to peak or trough to trough. The wavelengths of the light we can see range from 400 to 700 nanometers (or billionths of a meter). But the ...
Like many other inventions, HEPA filters developed over time: there doesn't appear to be a single inventor who deserves sole credit.Photo: Air filters in gas masks: HEPA filters were originally developed in the 1940s for military use—and they remain an important line of defense against ...
Find out who your suppliers are for each fuel.If you have different suppliers for your gas and electricity but want to do a dual fuel switch, make sure you state who supplies which fuel type during your switch. Your meter information does not match the information in the national database ...
If you want to see a hologram, you don't have to look much farther than your wallet. There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of...
some 15-year-olds nevertheless think that they will work as scientists. It may be a case of not knowing the unknown. I’ve fallen into this same trap myself. After flipping through an easy-to-read science book (How to Remove Your Own Appendix, orQuantum Explanations of Everyday Accidents...
The idea behind aneon lightis simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. The...
When I queried it I was told that the price per unit of gas has changed but that the meter hasn't been updated. I was then told that this was my fault for not keeping track of the change in gas prices via the news and then asking them to come and update the meter. I told...
the of and to a in that is was he for it with as his on be at by i this had not are but from or have an they which one you were all her she there would their we him been has when who will no more if out so up said what its about than into them can only other time new...
If you want to see a hologram, you don't have to look much farther than your wallet. There are holograms on most driver's licenses, ID cards and credit cards. If you're not old enough to drive or use credit, you can still find holograms around your home. They're part of...
This is what makes paper so incredibly useful -- you can read the words on a printed page regardless of the angle at which your eyes view the surface. Refraction occurs when a ray of light passes from one transparent medium (air, let's say) to a second transparent medium (water). ...