# In Quantum tunneling, why is the transmission proportional to electric current?

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- YKhanLv 71 month ago
The more electrons that are travelling through a given location, the more chances that they will tunnel.

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- Anonymous1 month ago
Depends on your definition of 'transmission'. But basically the transmission (T) is proportional to the probability (p) of an electron tunelling through the barrier. The current (I) is proportional to the number of electrons tunnelling through the barrier per second.

If p increases by a factor f, then T increases by the same factor f, so I increases by the same factor f. T and I have increased by the same factor so they are proportional.

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