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Issues
September 1993
ISSN 0031-9228
EISSN 1945-0699
Letters
What Really Keeps Women from Physics?
John L. Wallace; Janis Cortese; Suzanne Hidi; Paul J. Drallos; Kristin Natvig Swenson; Crystal A. Barker; David Ingham; Mary H. Fehrs; Roman Czujko
Physics Today 46 (9), 11–92 (1993);
https://doi.org/10.1063/1.2809026
Search and Discovery
Articles
Photovoltaics: Unlimited Electrical Energy from the Sun
Physics Today 46 (9), 22–29 (1993);
https://doi.org/10.1063/1.881362
Bulk electrical power generation using the available solar energy of a kilowatt per square meter will occur when photovoltaic cells decline in price below 10 cents per kilowatt‐hour.
Boltzmann's Entropy and Time's Arrow
Physics Today 46 (9), 32–38 (1993);
https://doi.org/10.1063/1.881363
Given that microscopic physical lows are reversible, why do all macroscopic events have a preferred time direction? Boltzmann's thoughts on this question have withstood the test of time.
The 1993 International Physics Olympiad
Physics Today 46 (9), 40–44 (1993);
https://doi.org/10.1063/1.881364
United by a common interest in physics, high school students from around the world came to Williamsburg, Virginia, for a week of exams, tours and social activities.
Career Choices
Washington Reports
Washington Ins & Outs: Choices for DOD, Energy and Commerce Mostly Familiar Faces in R&D Policy
Physics Today 46 (9), 55–57 (1993);
https://doi.org/10.1063/1.2809033
Physics Community
Books
Genius in the Shadows: A Biography of Leo Szilard, the Man Behind the Bomb
Physics Today 46 (9), 63 (1993);
https://doi.org/10.1063/1.2809040
From C‐Numbers to Q‐Numbers: The Classical Analogy in the History of Quantum Theory
Physics Today 46 (9), 67–68 (1993);
https://doi.org/10.1063/1.2809045