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You see a ash oflightning and hear the thunder 12 seconds later. Calculate how far away from you {in km} the lightning strike was? {Speed

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You see a ash oflightning and hear the thunder 12 seconds later. Calculate how far away from you {in km} the lightning strike was? {Speed of sound = 333 ms") The image seen by a pinhole camera is 5 cm in height. The image is formed 18 em away from the pinhole. What is the height of the object ifthe object is situated 45 m away from the pinhole

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