DeeVas

  "There is nothing more deceptive than an obvious fact "   - Cheryl Powers 1. Triple Point: Water can exist in liquid, gas and solid form at the same time. The single combination of pressure (approx. 611 pa) nd temperature (273K) at which liquid water, solid ice and water vapor can coexist in a stable equilibrium. 2. Astronaut's height in space! Astronauts height increases in space. When astronauts enter into the outer space from the Earth, the gravity that acts on them is low and after a certain limit the gravity that acts on them becomes zero . Therefore the downward force that acts on their bones will be zero or very low. So the height of that person in space increases 2 inches . But when they return back to Earth, they will again experience the gravity and their height becomes normal again. 3. Einstein against Quantum Mechanics! Einstein contributed many works in different fields of physics. Though he is known for his contributions to the development of quantum theo...

  Sometimes it's the detours which turn out to be the fruitful ideas  - Roger Penrose 1.  Sir C.V. Raman (1888-1970)   Alma matter : Presidency college, University of Madras. Research field : Optics and acoustics Awards received: Nobel Prize, Bharat Ratna, Lenin Peace Prize, Fellow of Royal Society. He is known for his prominent work in scattering which led to the discovery of Raman effect. 2.  Satyendranath Bose (1894-1974) Alma matter : Presidency college, Calcutta. Research field : Quantum Mechanics Awards received: Padma Vibhushan, Fellow of Royal Society He is known for the invention of boson and Bose-Einstein condensate. 3.  Meghnad Saha (1893-1956) Alma matter : Presidency college, Calcutta and Rajabazar Science College. Research field : Quantum and Statistical Mechanics, astrophysics. Awards received: Fellow of Royal Society He is known for developing Saha ionization equation. 4.  Homi J. Bhabha (1909-1966) Alma matter : University of Cambridge...

   eV is abbreviated as “electron-Volt”. Electron Volt is a simplified unit of energy. We know that joule ‘J’ is the S.I unit of energy. But why do we use eV then? Let’s see. The basic definition of an electron volt is, ‘It is the energy that an electron gains when it travels through a potential of one volt'. The energy associated with an electron is measured in small unit called eV. For an understanding, let us consider a parallel plate capacitor with positive charged plate on the left   side and the negative charged plate on the right side connected by a battery of 1V potential difference. Consider an electron on the side of a negatively charged plate which is attracted to the positive charged plate due to electrostatic force.  Therefore a kinetic energy is created when the electron moves from plate A to B. This kinetic energy is measured as one electron volt. 1eV means 1.6 x 10^-19 coulomb x 1 volt or just 1.6 X 10^-19 Joule. Though we have the S.I unit of energy ...

         As we already saw in our blog ‘How do we see colors’, “It’s the material, Not the color! – how do we see color?”, black body is an ideal object.          Black body is an object that can absorbs all frequencies of radiation.          Due to this the object get heated up and when its temperature equals to the surrounding temperature, the object starts to radiate energy in the form of electromagnetic radiation .         Depending upon the temperature of the body the intensity of the radiation of different frequency varies.          Almost all the object behave like an black body (but not like an ideal one), example: sun, human body, hot objects …          In 18 th century when scientist thought that they found almost everything in the field of physics, black body concept came as a challenge in front of them.        ...

           Earth is rotating on its axis about  1673 km/h.          Why do earth spin? is an age old question. Not only earth , everything in the universe spin .          And the common answer for such questions is inertia – the ability to resist change in motion.          But now, let's think deep into it.         To answer this we have to go to the beginning, about 4.5billion years ago.          In our old blog Nebula, we saw how the stars are formed.          4.5 billion years ago our solar system was formed from a nebula .           In that nebula as usual when hydrogen and helium atoms contracted and expanded, the nebula stated to rotate with an angular momentum. As the process goes on also, the direction of spin didn’t change.          After somet...

Physics is divided in to four major domain with respect to size and speed.          Particle size more than a nanometer and in less speed compared to speed of light – classical mechanics.          Particle size less than a nanometer (near to size of atom) and in less speed compared to speed of light – quantum mechanics.          Particle size more than a nanometer and in speed comparable to speed of light – relativistic mechanics.          Particle size less than a nanometer (near to size of atom) and in speed comparable to speed of light – quantum field theory. Any type of study under physics will come under this four categories. With respect to energy:          Milli electron volt to few electron volts   -   solid state physics          Kilo electron volt to million electron volt   - nuclear physics   ...