. Practical physics. ces, existing there per-haps in the form of the kinetic energy of rotation of theelectrons. The most vitally interesting question which thephysics of the future has to face is. Is it possible for man togain control of any such store of subatomic energy and to useit for his own ends ? Such a result does not now seem likelyor even possible ; and yet the transformations which the studyof physics has wrought in the world within a hundred yearswere once just as incredible as this. In view of what physicshas done, is doing, and can yet do for the progress of theworld, can anyone
. Practical physics. ces, existing there per-haps in the form of the kinetic energy of rotation of theelectrons. The most vitally interesting question which thephysics of the future has to face is. Is it possible for man togain control of any such store of subatomic energy and to useit for his own ends ? Such a result does not now seem likelyor even possible ; and yet the transformations which the studyof physics has wrought in the world within a hundred yearswere once just as incredible as this. In view of what physicshas done, is doing, and can yet do for the progress of theworld, can anyone be insensible either to its value or to itsfascination ? QUESTIONS AND PROBLEMS 1. Why is it necessary to use a rectifying crystal or. an audion inseries with a telephone i-eceiver to detect electric waves? 2. Explain why an electroscope is discharged when a bit of radiumis l>rought near it. 3. The wave length of the shortest X rays is about .00000001 low many times greater is the wave length of green light?. William Conrad RoNtGEN, Munich Discoverer of X rays Antoine Henri Becquerel,Paris Discoverer of radioactivity
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922
