Pencil (1 × 10-2 m) Virus (1 × 10-6 m) Red Blood Cell (1 × 10-4 m) Dust Particle (1 × 10-7 m) Now you could imagine how small an atom would be. An atom is thousand times smaller than the thickest human hair. It has an average diameter of 0.000000001 m or 1 ×Continue reading “Atomic theories”
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What is light year?
Light yearThe nearest star to oursolar system is ProximaCentauri. It is at a distance of2,68,770 AU. We can note herethat using AU for measuringdistances of stars would be unwieldy. Therefore,astronomers use a special unit, called ‘lightyear’, for measuring the distance in deep space.We have learnt that the speed of light in vacuumis 3 × 108Continue reading “What is light year?”
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