The word demo is printing across xrays in dolphin imaging

For instance, many scientists have tacitly assumed that gravity signals, and the force of gravity between masses, are communicated ('mediated') back and forth by streams of photons traveling at the velocity of light - some have assumed that gravity will be explained as arising from some type of EM wave. But the force of gravity is actually some 42 orders of magnitude weaker (10 -42) than the electrical forces which generate light waves and radio waves!Д«ecause of this huge difference in energy levels, we actually know little about gravity. Gravitational forces seem to us to be powerful, because it is gravity which holds us to the earth's surface and makes us work hard to lift and move things. The concept of 'wave-particle duality' is well established by experimental evidence and the excellent models of Quantum Mechanics. Whether one uses a wave model or a particle model for light is largely a matter of convenience for the physicist. (Photons are very small, yet the human eye is sufficiently sensitive that we can sometimes detect even a single light photon with dark-adapted eyes). Each photon constituting a 'particle' of light has an energy equal to Planck's constant times the speed of light divided by the wavelength. EM radiation is a result of moving electrical charges (currents), and all forms of EM radiation can be described mathematically as consisting of streaming photons. In this century has also come the realization that we can equally well describe light and other EM radiation as if it were corpuscular in nature. The signal speed of EM waves ranges upwards to a maximum value which is the current speed of light, ~3 x 10 8 meters/sec. Light waves, radio waves, heat signals, X-rays, and the like, are electromagnetic (EM) radiation - all forms of which can transmit energy and carry useful information even across vast reaches of 'empty' space. Many of these 'rays' pass through our bodies unimpeded. Nor do we realize that radio and television signals from a hundred stations fill our living rooms. Heat and light from the sun are obvious, but we are unaware of cosmic rays penetrating our bodies at the rate of perhaps 10 per second.

Without the sun's constant energy input, our planet would quickly radiate away its latent heat and freeze us and everything else very solid in short order.

It is this heat and light from a modest star (surface temperature only 5500 degrees C), that all life processes on earth are ultimately driven. Light from the sun arrives at the top of the earth's atmosphere at a power level of about one kilowatt per square meter. Many different kinds of electronic sensing instruments now tell us vastly more about the cosmos than our eyes alone can tell us directly. Just in our century, science has quickly extended the range of the eye for explorative purposes. Discovery of the wave nature of light soon led to the realization that our universe is permeated with electromagnetic waves ranging in wavelength over at least 16 orders of magnitude - from ultra low-frequency radio waves, which are tens of kilometers in wavelength, to cosmic rays with wave crests and troughs only a millionth of a millionth (10 -12 ) meter apart. Young Isaac Newton in 1666 used a prism to break visible white light into the rainbow colors of the spectrum, giving impetus to the development of what is now the vast science of optics. However, as wonderful as our eyesight is, we are able to see only electromagnetic waves between 400 and 700 nanometers (4 to 7 x 10 -9 m) in wavelength.

Human vision is utterly amazing in its ability to receive and process a wealth of information concerning levels of light intensity, colors, motion, and stereoscopic depth of field.

The word demo is printing across xrays in dolphin imaging