By TOM PETRUZZELLIS
54 super-entertaining tasks provide insights into the attractions, sounds, and scents of nature
Nature meets the Evil Genius through fifty four enjoyable, secure, and cheap initiatives that let you discover the interesting and sometimes mysterious global of common phenomena utilizing your personal home-built sensors. each one venture features a record of fabrics, assets for elements, schematics, and many transparent, well-illustrated directions. * tasks comprise: rain detector, air strain sensor, cloud chamber, lightning detector, digital gasoline sniffer, seismograph, radiation detector, and extra
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Extra info for Electronic Sensors for the Evil Genius: 54 Electrifying Projects
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For example. a DF-5000 delector is designated to detecl lighl with a wavelength of SOO nanometers. E G & G a lso sells photodiodes witho ut fi lters. xxx detectors with built -in filt ers cost $95 . Wh ile Ihis may seem high. you don 't have to go to the trouble of moun ting a fil ter on a detector. I o(l) rt (l) o rt ..... o ::s ~ ::s p.. s:: (l) ~ en c:: t; (l) a (l) ::s Chapter Two Li ght Dete c tion and Measurement 35 rt EG&G will supply a calibrated detector for an addi tional $75. o ther words.
A Fre nch scientist. in 1838. Then. in 1873. K. Smith discovered the change in eleclrical resistance of se lenium when il was exposed 10 light: the pliolOcolU/llctin' effect. H. Hertz obse rved the photocmissivc effe ct during his experiments wi th electromagnetic W As you place the sol ar cell over or ncar diffe rent portions of the T V scree n. you will hear the buzz change slight ly as the piclUre scene changes. Numbers and lcucrs cause a particularly - Listening to Burning Objects TIle rc are some interesti ng sounds to be heard (rom burning objects. We will discuss matches. sparks. and candles. Listening to the sound that the light of a burning match makes is rarher impressi\·e. t to 6 inches away from the solar cell . You will hear a rapid. popping signal.