By David Burnie
Observe the fantastic global of sunshine -- from historical myths to the optic discoveries that experience revolutionized smooth lifestyles.
Here is a astounding, thought-provoking, and hugely informative advisor to the interesting tale of sunshine. exceptional full-color images of unique gear, complicated clinical tools, revealing experiments, and three-D types deals a special "eyewitness" view to the really good discoveries that experience reworked our global. See why historical peoples worshipped the sunlight as a god, how gentle rays bend, why issues glow once they are extremely popular, what creates a colour tv photo, how microscopes and telescopes have been invented, and why a leaf seems eco-friendly. learn the way fiber optics can transmit gentle, what occurs in the course of an eclipse, why pictures are reversed in mirrors, how a lcd works, and what makes a hologram. observe what explanations the eerie "Will o' the wisp", how a few animals could make their very own mild, what creates a mirage, why we burn in robust sun, what a polarizing clear out does, why we see rainbows, what a quantum is, how X-rays penetrate bodies, and masses, a lot more!
Read Online or Download Eyewitness: Light PDF
Similar nature & how it works books
The fourth and ultimate identify within the financial institution highway Museum sequence is Floratorium. every one identify is laid out like a museum journey. This one is ready crops & Botany. The desk of contents is laid out like a map of the museum and you'll use it to visit any web page that's one of many museum's halls. IE corridor of Flowering vegetation, corridor of Saltwater vegetation, Ect.
Electricity experiments for children
Fifty-five tasks in electrical energy, magnetism, electronics; creating a compass, wiring an easy electromagnet, acquiring electrical energy from a lemon, reactivating a dry telephone, creating a flashlight, developing a Geiger counter. All secure.
Science Facts to Surprise You!
This identify is stuffed with enjoyable and engaging technological know-how proof that could shock your little readers! a colourful, full-bleed photo accompanies each one enjoyable truth to draw these reluctant readers. entire with a desk of contents, thesaurus, index, or even extra evidence!
Extra info for Eyewitness: Light
Example text
BEYOND THE VISIBLE William Herschel investigated the link between light and heat in order to solve a practical problem. He wanted to look at sunspots through his telescope, but he found that even with colored filters the sun’s heat was too great for comfortable viewing. He thought that if he could find out exactly which colors were “more apt to occasion heat” he could do something to cut them out. His experiments helped him devise green lenses which blocked some of the heat. THREECOLOR VISION “Response curve” of cones most sensitive to blue “Response curve” of cones most sensitive to green Gr ee n Bl ue “Response curve” of cones most sensitive to red Vi ol et Isaac Newton (p.
All Rights Reserved. LINES IN THE SPECTRUM The strips above show the sun’s spectrum in great detail. In it, hundreds of tiny lines called “Fraunhofer lines” can be seen. The sun’s light is created by hot atoms on its surface. When this light travels through cooler atoms in the sun’s outer atmosphere, some of its wavelengths are absorbed. Each kind of atom absorbs particular wavelengths, producing characteristic lines. ” Fluorescence SOAP POWDER IN DAYLIGHT Sometimes atoms absorb light of one wavelength, but almost immediately release the energy as light of another wavelength.
Solar cells work as a result of the photoelectric effect (p. 44). Instead of pushing electrons out of a metal, light falling on a solar cell is used to loosen electrons within a “semiconductor,” usually silicon. The light energy arrives at the cell in packets, or photons, and these dislodge electrons within the silicon to create the current. The voltage produced across the cell depends on the wavelength of light that it uses. Green light gives electrons the same energy as a 2-volt battery. However, most solar cells are designed to work with light of longer wavelengths.