2(5) (a) For an electron in a 2D cubic box with a side of 10 nm calculate the wavelength of the photon that would cause the transition between the ground state and the first excited state.
Quantum mechanics and hydrogen atom
Consider an electron of mass m moves with the velocity v in a hydrogen atom. If an electron is at a distance r from the proton, then the potential energy function of the electron can be written as follows:
Isotopes of Hydrogen Atoms
To understand isotopes, it's easiest to learn the simplest system. Hydrogen, the most basic nucleus, has received a great deal of attention. Several of the results seen in more complex nuclei can be seen in hydrogen isotopes. An isotope is a nucleus of the same atomic number (Z) but a different atomic mass number (A). The number of neutrons present in the nucleus varies with respect to the isotope.
Mass of Hydrogen Atom
Hydrogen is one of the most fundamental elements on Earth which is colorless, odorless, and a flammable chemical substance. The representation of hydrogen in the periodic table is H. It is mostly found as a diatomic molecule as water H2O on earth. It is also known to be the lightest element and takes its place on Earth up to 0.14 %. There are three isotopes of hydrogen- protium, deuterium, and tritium. There is a huge abundance of Hydrogen molecules on the earth's surface. The hydrogen isotope tritium has its half-life equal to 12.32 years, through beta decay. In physics, the study of Hydrogen is fundamental.
2(5)
(a) For an electron in a 2D cubic box with a side of 10 nm calculate the wavelength of the photon that would cause the transition between the ground state and the first excited state.
(b) For a particle of mass m in a 2D cubic box of side L, what is the degeneracy of a state whose energy is 8.125×h2/mL2
(c) Consider an electron in a 1D box of length 2 nm in a state with n=2.
- Sketch the wavefunction.
- What is the number of nodes in this wavefunction? Determine the locations of these nodes in nm.
- What is the number of points of maximum probability density in this wavefunction? What are these points (determine their positions in nm)?
- What is the probability to find the electron between the two points: x = 0 nm and x = 1 nm?
- Calculate the energy of the electron in 1D box in a state n=2 (n = 2, L=2 nm). Express your answer in eV.
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