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Question: Keeping a constant speed of 0.6 m/s, a marble of mass 18 g rolls back & forth across a shoebox that is 14 cm high & 2 mm thick. Find the probability of its escaping through the wall of the box by quantum tunnelling. (Write your answer in the form 10n, where n is an exponent with 1 significant figure, eg -5e15.) Find the value of n?

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