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Use wide-barrier approximations to estimate the probability an electron with a 1.5 eV energy deficit will...

Use wide-barrier approximations to estimate the probability an electron with a 1.5 eV energy deficit will tunnel through a 3*10^-10 m vacuum gap?
Answer = 0.023?
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When an electron travell with kinetic energy E falls on a potential barrier of height V then classically the electron get reflected. But quantum mechanically the electron tunnel through the potential well. The probability of tunneling of electron given below.

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