What is meant by refraction of a wave?


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Who first described how shock waves are formed?

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why is a coin in a vessel not vissible when seen fromjust below the edge of the vessel but can be viewed from the same position when water is poured into the vessel ?

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What is the cause of brownian motion?

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Suppose a car is traveling at 72kmph, and if that car slows down to 60kmph it takes an extra 1 hour to cover that same distance. At 72kmph, how long did it take forthe car to cover that distance?

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Why is it easier to lift a stone in water than in air ?

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Explain about Bessemer?

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