Category Archives: Physics

Death-proof safety elevator

Today’s safety elevators don’t fall when cable breaks. A lock invented by American industrialist Elisha Otis locks the elevator while descending at high speed and hence prevents falling. This death defying elevator was introduced in 1852. Watch this discovery channel video to see how it was invented.… Read the rest

Solar & lunar eclipse explained

What is the difference between solar and lunar eclipse? Did you know a lunar eclipse on earth is like a solar eclipse on moon? Why lunar eclipse is so common compared to solar eclipse? You can watch lunar eclipse with naked eye, but not solar eclipse. Watch the video, physics girl explains all.… Read the rest

Behavior of water in space

Canadian astronaut Chris Hadfield shows how water behaves in weightless environment of space station. He tries to wring out water from a wet wash cloth but because of surface tension water sticks with his hand like jelly and he uses another dry wash cloth to remove water from his hand.… Read the rest

Photoelectric Effect

Application of photoelectric effect is everywhere around us. Digital camera, light meter in playground, solar panel, night vision device and many things are made using photoelectric effect. Albert Einstein is famous for his special theory of relativity. But he received his Nobel Prize for explaining the photoelectric effect not for his special theory of relativity.… Read the rest

Fluorescent lamp explosion and ballast

Usage of fluorescent lamp is increasing because it’s four to six times efficient than incandescent lamp. Plasma state of matter is used in fluorescent lamps. Resistance of plasma decreases when electricity conducts through it. The danger lies in this property. Uncontrolled current through the plasma in the tube may produce heat and eventually the tube… Read the rest

Uncertainty principle

Werner Heisenberg Werner Heisenberg Uncertainty principle was proposed by German physicist Werner Heisenberg in 1927. Werner Heisenberg (1901-1976) was born in Duisberg, Germany. He studied theoretical physics at Munich, received Nobel Prize in 1932. He stayed in Germany during Second World War and led research for nuclear weapon project. A gunman was sent by United… Read the rest

Van Allen radiation belts

Radiation belts are two ring shaped layer of plasmas high above earth’s surface. Earth’s magnetic field is responsible for keeping them in place. Sometimes the inner belt is called Van Allen belt because James Van Allen discovered it in 1958. The lower belt The lower belt starts at top of the atmosphere and exists up… Read the rest