Reflection, refraction, diffraction, oh my! Dive into the wonderful world of electromagnetic radiation--i.e., the energy that travels through space in waves, like x-rays, microwaves and good old visible light.
Lawrence Livermore National Laboratory, a national security lab in California, put this poster produced in 1944 by the W.M. Welch Scientific Company up on the lab's Flickr page recently. Apparently it was rescued from the back corner of an unused office. Who'd want to hide this piece of science history?
On occasion a scientific study is done, 'if cell phones produce harmful radiation', which tend radiate in the tiniest of power. But, what I have notice and is pretty much ignored is 'if portable radios, like those used in the government and industrial world "Motorola transmits 5 watt or more portable radios" are harmful or not?
The commonly used industrial standard walky-talky type portable radios transmit in the range of 5 watts or more power and the antenna are next the head of the person broadcasting. The power out of these radios greatly exceeds those of a cell phone and therefore has the potential to do a 1000x more damage.
If those were shown to the public, all kinds of lawsuits would happen! LOTS!
Instead the focus is all towards those itty bitty power outputting, basically harmless cell phones.
I remember a copy of this very chart hanging up in my science class room at Tombstone High School, Tombstone, AZ, decades ago.
VERY cool chart id love to have one. On a side note is anyone visiting a science site really stupid enough to visit one of these MANY spammers websites?
Want a full size copy in high res? Found it! It's on Imagekind.
This art and photo sharing site has it, and can print it in MASSIVE size, which is the original size. You can select the surface you prefer and they print it for you. It looks Fabulous...