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Which of the given expressions correctly indicates the exponential decay of the current amplitude with the distance?

Which of the given expressions correctly indicates the exponential decay of the current amplitude with the distance? Correct Answer I ~ Ve-cd

The expression that correctly represents the exponential decay of the current amplitude with the distance is given by; I ~ Ve-cd Where I is the tunneling current, V is the voltage between probe and sample, c is constant and d is the probe-sample separation distance.

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