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Suppose that an STM scans a surface at a distance of a = 1.500 nm. Take the height of the potential energy barrier to be

Suppose that an STM scans a surface at a distance of a = 1.500 nm. Take the height of the potential energy barrier to be U0 E = 1.70 eV. If the distance between the surface and the STM tip decreases by (7.12x10^0)% estimate the percentage change in the tunneling current

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