Telephone communication has so deeply penetrated into our environment that we cannot imagine our life without it. Pick up the phone, dial a number and hear the voice of a friend or a beloved. What could be simpler? But behind this the great work of physicists, engineers, electricians and people of other professions was done.
Physics - Page 5
Where Could Photoelectric Effect Lead to?
The sun gives us almost everything: light, heat, hydrocarbons, food … And its generosity is boundless. The funny fact is that in ancient times, people used windmills, rivers’ energy and other tricks to ease the life. Over the years, humanity has gone through a technological revolution, moved to more productive ways of generating energy. In recent times, alternative energy is being increasingly talked about (like solar batteries). This is due to the fact that natural resources (gas, oil …) come to an end, and the rest is becoming harder and harder to produce.
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Quantum Computer
The Canadian company D-Wave has demonstrated the first operating quantum computer Orion. Thus, the actual quantum calculations became possible for tens of years earlier than it was previously planned.
What is a quantum computer? For the layman it is a computing engine before which a conventional computer is like abac prior to the time of computers. And, of course, it is something very far from reality. Continue reading
Kepler’s Law of Planetary Motion
Johannes Kepler, a German mathematician and astronomer who lived between 1571 and 1630 was a determined scientist who was so interested in studying the motion of planets such that he started to demonstrate early in his career that the planets were always in circular motion in agreement with the Aristotelian credence using Platonic solids to describe the motion of the planets.
Kepler inherited the works of Tycho Brahe, a Danish astronomer who died in 1601and to whom Kepler was a friend and assistant. Kepler studied Tycho’s works and data without a telescope; he came to understand many things about the planets and their motions particularly that if focus could shift from seeing the earth as the centre of the universe to the sun being the centre, then he concluded that the motion of the planets must then be seen as elliptical.
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Dark Matter
When you look up at night, you see myriads of stars spread across the sky. When astronomers look into the deepest reaches of the universe with powerful telescopes, they see myriads of galaxies, organized into large clusters and other structures. This might lead you to believe that the universe is composed mainly of galaxies, stars, gas and dust – things that you can see. However, most astronomers believe that visible matter makes up only a small fraction of the mass of the universe. The majority of the universe is made of stuff we can’t see – so-called dark matter.
String theory – quantum mechanics and astronomy at one scale.
The whole thing begun in 1968 when Gabriele Veneziano, who worked at CERN in Geneva, discovered that the Euler Beta function is quite suitable to explain the physical properties of strongly interacting particles. Working further on this concept scientist all over the world came to a conclusion that all observed elementary particles in fact are vibrating 1-dimentional closed circuit strings. The more intensive the vibration – the more massive particle we will observe. After the years of theoretical research this simple idea transformed into a so called “string theory”, one of the most complicated and promising branch of modern theoretical physics and astrophysics. Continue reading
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