Question

A laser emits 2.36 eV photons. If this emission is due to electron transitions from the n=2 to n=1 states of an infinite square well, what's the well width? Express your answer using two significant figures.

Answer #1

Which of the following electron transitions in a hydrogen atom
results in the emission of photons with the shortest wavelength? A)
n = 3 to n = 4 B) n = 1 to n = 3 C) n = 6 to n = 4 D) n = 7 to n =
5 E) n = 2 to n = 5

A laser emits light that has a frequency of 6.69 x
1014 s-1. If the laser emits a “pulse” (a burst of
light) that contains 7.0 x 1017 photons, what is the
total energy of that pulse in Joules?
Do not use scientific notation in your answer. Give the answer (
in Joules) to 2 significant figures.

A high-energy pulsed laser emits a 1.0-ns-long pulse of average
power 8.3×1011 W . The beam is 1.1×10?3m in radius.
Part A
Determine the energy delivered in each pulse.
Express your answer using two significant figures.
E =......?...... J
Part B
Determine the rms value of the electric field.
Express your answer using two significant figures
Erms = .....?...... V/m

An electron is bound in a finite square well of width 2.00 nm
and finite depth U0=6E?, where E?is the
ground-state energy for an infinitely deep potential well that has
the same width.
Part A
If the electron is initially in the ground state level of the
finite square well, E1=0.625E?, and absorbs a
photon, what maximum wavelength can the photon have and still
liberate the electron from the finite well?
Express your answer numerically in meters using three
significant...

A LASIK vision correction system uses a laser that emits 10 ns
-long pulses of light, each with 2.5 mJ of energy. The laser is
focused to a 0.75 mm -diameter circle.
Part A- What is the average power of each laser pulse?
Part B-What is the electric field strength of the laser light at
the focus point?
Express your answers using two significant figures.

Astronomers use the line emission from the quantum state n = 3
to n = 2 to probe ionized hydrogen gas – that is, hydrogen gas
stripped of its electron. In ionization equilibrium, a balance is
established between the process of ionization and its reverse,
recombination, in which a free electron e − and proton p recombine
to form neutral atomic hydrogen H, releasing one or more photons γ
: e − + p ↔ H + γ
The recombination...

An electron is trapped in a square well of unknown width,
L. It starts in unknown energy level, n. When it
falls to level n-1 it emits a photon of wavelength
λphoton = 2280 nm. When it falls from n-1 to
n-2, it emits a photon of wavelength λphoton =
3192 nm.
1) What is the energy of the n to n-1 photon
in eV?
En to n-1 =
2) What is the energy of the n-1 to n-2 photon...

The hydrogen atomic emission spectrum includes a UV line with a
wavelength of 92.323 nm. Photons of this wavelength are emitted
when the electron transitions to nf = 1 as the final
energy state. Show all steps and round answers to correct sig
figs.
a) Is this line associated with a transition between different
excited states or between an excited state and the ground
state?
b) What is the energy of the emitted photon with wavelength
92.323 nm?
c) What...

One series of lines in the hydrogen spectrum is caused by
emission of energy accompanying the fall of an electron from outer
shells to the fourth shell. The lines can be calculated using the
Balmer-Rydberg equation:
1λ=R∞[1m2−1n2]
where m=4, R∞ = 1.097×10−2nm−1, and nis an
integer greater than 4.
Part A
Calculate the wavelengths in nanometers of the first two lines
in the series.
Express your answers using four significant figures separated by
a comma.
Part B
Calculate the energies...

(HW03-22.23) An electron is released from rest at a distance of
0.600 m from a large insulating sheet of charge that has uniform
surface charge density 4.30×10?12C/m2 .
A) How much work is done on the electron by the electric field
of the sheet as the electron moves from its initial position to a
point 3.00×10?2 m from the sheet?
Express your answer to three significant figures and include the
appropriate units.
B)
What is the speed of the electron...

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