Question

Explain why the energy barrier height changes when a diode is biased

Answer #1

An
electron with an energy of 5.5 eV approaches a potential barrier of
height 6.1 eV and thickness of 1nm. What is the relative
probability that the electron passes through the barrier? What
barrier height should be used to decrease the relative probability
by a factor of 100?

Explain, with diagrams, why a monopolistic non-renewable energy
resource
market is biased toward conservation and will therefore increase
the life of the
energy resource.

Explain, with diagrams, why a monopolistic non-renewable energy
resource market is biased toward conservation and will therefore
increase the life of the energy resource.

Explain with a diagram why monopolistic non-renewable
energy resource market is biased towards conservation and will
therefore increase the life of the energy resource

1. A beam of protons of energy 3.75 MeV is incident on a barrier
of height 18.00 MeV and
thickness 1.65 fm (1.65 x 10^ -15 m). (a) What is the probability
of the protons tunneling through the barrier?
(b) By what factor does the probability change if the barrier
thickness is doubled ?

Consider a finite potential barrier of height U_0 = 3eV between
0<x<L where L=2nm. The energy of an electron incident on this
barrier is E=2eV.
A) What is the general form of the wavefunction Ψ (x) in the
barrier region? Compute numerical values for constants when
possible.
B) Sketch the wavefunction of the electron before, inside, and
after the barrier.

A beam of electrons with kinetic energy 25 eV encounter a
potential barrier of height 20 eV. Some electrons reflect from the
barrier, and some are transmitted. Find the wave number k of the
transmitted electrons.
You can take U = 0 for x < 0, and U = 15 eV for x > 0

Electrons are fired at a rectangular potential energy barrier,
once every 245 ms. If the barrier is 2.55 nm thick and has a height
that exceeds the energy of the incident electrons by exactly 612
meV, how long on average would you expect to wait for one electron
to pass through the barrier?.

Electrons are fired at a rectangular potential energy barrier,
once every 173 ms. If the barrier is 2.55 nm thick and has a height
that exceeds the energy of the incident electrons by exactly 662
meV, how long on average would you expect to wait for one electron
to pass through the barrier?

Suppose a beam of 4.00 eV protons strikes a potential energy
barrier of height 6.20 eV and thickness 0.560 nm, at a rate
equivalent to a current of 1150 A. (a) How many years would you
have to wait (on average) for one proton to be transmitted through
the barrier? (b) How long would you have to wait if the beam
consisted of electrons rather than protons?

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