Question

a) An electron in a quantum system has allowed energies 1eV,
3eV and 9 eV. What wavelengths are observed in the emission
spectrum of this system? Show your work.

b) If you must choose from wavelengths obtained in part a) as
light source for a photoelectric effect demonstration, with which
material(s) will you build your cathode, and with what wavelength
you would shine on it?

Show your work.

Answer #1

The allowed energies of a quantum system are 0.0 eV, 6.0 eV ,
and 8.5 eV . What wavelengths appear in the system's emission
spectrum? Enter your answers in ascending order separated by
commas.

The allowed energies of a simple atom are 0.00 eV, 4.21 eV , and
5.63 eV .
Part A
What wavelengths appear in the atom's emission spectrum?
Enter your answers in ascending order separated by commas.
Part B
What wavelengths appear in the atom's absorption spectrum?
Enter your answers in ascending order separated by commas.

The allowed energies of a simple atom are 0.00 eV, 3.73 eV , and
5.58 eV .
Part A
What wavelengths appear in the atom's emission spectrum?
Enter your answers in ascending order separated by commas.
Part B
What wavelengths appear in the atom's absorption spectrum?
Enter your answers in ascending order separated by commas.

The allowed energies
of a simple atom are 0.00 eV, 4.05 eV , and 5.12 eV .
Part
A
What wavelengths
appear in the atom's emission spectrum?
Enter your answers in
ascending order separated by commas.
Part
B
What wavelengths
appear in the atom's absorption spectrum?
Enter your answers in
ascending order separated by comma

An electron confined to a one-dimensional box has energy levels
given by the equation
En=n2h2/8mL2
where n is a quantum number with possible values of
1,2,3,…,m is the mass of the particle, and L is
the length of the box.
Calculate the energies of the n=1,n=2, and
n=3 levels for an electron in a box with a length of 180
pm .
Enter your answers separated by a comma.
Calculate the wavelength of light required to make a transition...

A solar cell is built from a semiconductor material, such as Si,
in contact with a metal. As we will see later, when the
semiconductor is doped, an internal voltage is created within the
semiconductor. When photoelectrons are produced via the
photoelectric effect, these freed electrons move due to this
internal voltage, creating electric current.
(a) If silicon’s work function (i.e. the energy to free an
electron from an atom) is 1.2 eV, what is the maximum photon
wavelength that...

This is a challenging multi-step problem. Solve it on paper,
writing out each step carefully. When doing calculations, do not
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CHE 151-3rd Write your answers in the Blue Book provided. Start
each new question at the top of a new page. To receive full credit
for problems, you must show the correct setup with units and give
your answer with the correct number of significant figures. 1.a) A
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Learning Outcomes (Unit 2)
Perform quantitative calculations based on the relationship
between wavelength, energy, and the speed of light.
Identify and rank the different types of radiation which
comprise the electromagnetic spectrum.
Explain why classical mechanics doesn't describe electromagnetic
radiation.
Describe the photoelectric effect and relate the energy and/or
intensity of the photons to the work function and kinetic energy of
the ejected electrons.
Explain the origin of atomic and emission spectra and relate
these spectra to discrete energy levels....

1) Describe an example of each of the following that may be
found of your kitchen: Explain how your choice falls into this
category, and if there is a chemical name or symbol for it, provide
that as well. Provide a photo of your example with your ID card in
it. a) a compound b) a heterogeneous mixture c) an element (symbol)
Moving to the Caves… Lechuguilla Caves specifically. Check out this
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