Explain diffraction?
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Why is it easy to turn over a leaf with a wet finger ?
What is H1N1?
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Why is the apparent altitude of a star increased by reflection in atmosphere ?
What is the Spectrum?
What is the difference between intrinsic and extrinsic semiconductors?
What is balanced field takeoff?
What is the advantage of fixed pulley?
What is the velocity of sound in air ?
Why is one?s breath visible in cold, but not in not in hot weather ?
When a glass cylinder is filled with water and a piece of thick paper is placed at the mouth and the cylinder is inverted, the paper dies not fall. Why ?
How is nuclear fission different from nuclear fusion?
How much should be the minimum size of the ordinary mirror, so that and observer standing at the centre of room is able to see the whole of the height of the wall behind him ?