In the year 1827 Robert Brown, a Scottish botanist, observed pollen grains suspended in water using a microscope and his discovery startled him. He observed that tiny particles ejected from the pollen grains moved randomly in…
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The story of the invention of light bulb exemplifies the importance of perseverance in science. For those of you who are not aware of the story, Thomas Alva Edison invented the light bulb and he did…
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Albert Einstein, considered by many as genius personified, is a Germany born physicist whose theories in science have opened new avenues, explained in detail a lot of counter-intuitive observations and predicted many such counter-intuitive ideas that are,…
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100 years ago, in 1915, Albert Einstein came up with his General theory of relativity. Einstein published special theory of relativity in 1905 which dealt with inertial systems or systems that are in non-accelerating uniform motion.…
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Suppose there are two twin brothers, one of them remains on earth while the other goes for a space travel at a very high speed (comparable to the speed of light). The astronaut comes back from…
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Time is an obvious physical quantity that can be felt in daily life but defining it remains a challenge even for the physicists of current times. A famous scientist once said ‘time is something that flows…
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Michelson interferometer, as it is famously called, is used in the Michelson-Morley experiment. Earth moves around the sun at a speed of around 108000 km/h so when a light beam is shone along the direction…
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In the previous essay we have discussed about relative motion where Mr. A was chasing a car. Mr. A, moving at 3 km/h (w.r.t. reference), found the car’s speed is 7 km/h when the car was…
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Place yourself in a moving car, when you see the person next to you, he appears to be at rest, but for someone standing on the footpath the same person appears to be moving at certain…
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Electrical heating appliances like heaters and geysers are some of the luxuries offered by science. All of us use them in daily life and a day without these appliances is a nightmare in the cold countries…
