Electroluminescence in photovoltaic cell
Here we propose two methods to get electroluminescence images from photovoltaic cells in a school or home lab.
Physics
Physics / Physics.pop-Ph
All posts under category "Physics / Physics.pop-Ph"
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Improved Astable Multivibrator
The conventional two transistor astable multivibrator has been modified to produce better waveform which are more steeply rising and falling than those from the conventional astable. The improvement in the waveform is achieved by using a diode pair in each collector branch of the transistors. This r
Physics
Mathematical proof of fraud in Russian elections unsound
The Washigton Post had published allegations, that results of Russian elections 'violate Gauss's groundbreaking work on statistics.' I show that these allegations lack scientific basis.
Statistics
Applications
Physics
On the likelihood of non-terrestrial artifacts in the Solar System
Extraterrestrial technology may exist in the Solar System without our knowledge. This is because the vastness of space, combined with our limited searches to date, implies that any remote unpiloted exploratory probes of extraterrestrial origin would likely remain unnoticed. Here we develop a probabi
Astrophysics
Physics
System
Partition function of 1-, 2-, and 3-D monatomic ideal gas: A simple and comprehensive review
This article discusses partition function of monatomic ideal gas which is given in Statistical Physisc at Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia. Students in general are not familiar with partition function. This unfamiliarness was dete
Physics
Condensed Matter
Principle of Least Action and Theory of Cyclic Evolution
A natural process is defined as an act, by which a system organizes itself with time. Any natural process drives a system to a state of greater organization. Organization is a progressive change, while evolution is expressed in the effects of accumulating marks acquired from contingent encounters. C
Physics
Nonlinear Sciences
Santa and the moon
Happy end-of-the-year evening and night events provide good opportunities to explain the phases of the moon. The need for such moon phase education is once again demonstrated, through an investigation of illustrations on Santa Claus and Christmas gift wrap and in children's books, in two countries w
Physics
The Coriolis Effect Further Described in the Seventeenth Century
Claude Francis Milliet Dechales described the Coriolis effect in his 1674 Cursus seu Mundus Mathematicus. Dechales discussed and illustrated the deflection of both falling bodies and of projectiles launched toward the poles that should occur on a rotating Earth. Interestingly, this was done as an ar
Physics
Two exercises about neutrino departure times at CERN
Two simple exercises are solved, which educators can use to awake interest of their students in subtleties of the CERN Neutrino beam to Grand Sasso (CNGS) experiment. The first one is about the statistical error of the average departure time of neutrinos from CERN. The second one about a hypothetica
HEP-EX
HEP-PH
Physics
The falling raindrop, revisited
I reconsider the problem of a raindrop falling through mist, collecting mass, and generalize it to allow an arbitrary power-law form for the accretion rate. I show that the coupled differential equations can be solved by the simple trick of temporarily eliminating time (t) in favor of the raindrop's
Physics
Three limits to the physical world
Three limits to the physical world (quantum physics, gravity and dark energy) are presented on a triangular diagram having as summits the Planck scale, the Universe and a neutrino-like object.
Astrophysics
Physics
The falling slinky
The slinky, released from rest hanging under its own weight, falls in a peculiar manner. The bottom stays at rest until a wave hits it from above. Two cases -- one unphysical one where the slinky is able to pass through itself, and the other where the coils of the slinky collide creating a shock wav
Physics
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