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In quantum mechanics, if the energy of the particle, E, is less than the energy required to enter a region, U, the particle is always reflected back.

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In quantum mechanics, if the energy of the particle, E, is less than the energy required to enter a region, U, the particle is always reflected back.

(a) True

(b) False

I had been asked this question in an internship interview.

The above asked question is from Tunnel Effect topic in section Quantum Physics of Engineering Physics I

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Correct choice is (b) False

Explanation: In Quantum Mechanics, even if E < U, there is a chance that the particle might tunnel through it. This concept is different from the classical mechanics.

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