Using the Born approximation, obtain an integral expression for
the total cross section for scattering of particles of mass m from
the attractive Yukawa potential V(r) = - V0 exp [ -(r/a)²]
Are the molar extinction coefficient and cross-section of an
absorption related to the probability of absorption?
I have struggled to find a formal definition of cross-section of
absorption; from what I've gathered, its best defined as 'the
intensity of absorption'.
Wikipedia's formal definition of the molar extinction
coefficient is 'how strongly a species absorbs EMR at a given
wavelength, per molar concentration'.
So how are the molar extinction coefficient and cross-section
different? I presume that whilst the molar extinction coefficient...
Derive the expression for the time averaged heating in the metal
in which AC current of frequency ω flows – use the expression for
the AC conductivity and P= ⋅EJ relation for instant power
Given a radioactive nucleus with decay constant lambda and total
cross section Ot, determine the condition for which the nucleus
will most likely decay before it has a collision with a neutron, if
it is irradiated by a neutron beam with intensity Io
[neutrons/cm^2-s].
1. The proton-neutron differential scattering cross section is
symmetric about 90 degrees axis in center of mass frame of
reference. Why is this important?
2. What is the experimental evidence for partons?
3. What is the relation between strong interaction responsible
for binding of nucleons and one that binds quarks. Briefly state
most important similarities and differences.
4. Explain why scientists do not expect to observe free
quarks.
5. In what ways are electromagnetic and color charges similar
and different?
(from Reif, Chapter 12, problem 5)
The total scattering cross section for an electron-air molecule
collision is about 10^(-15)cm^2
At what gas pressure will 90 percent of the electrons emitted
from a cathode reach an
anode 20 cm away? (Assume that any electron scattered out of the
beam does not reach
the anode; i.e. neglect multiple scattering.)
Write a python programA3) Lambda Expressions. Use lambda
expression to sort the list ["democratic", "republican", "equal",
"python", "break", "two", "ruby"] by: a) the last 2 characters of
each list item in reverse order b) create new list from list above
where each item has only 3 characters and first one is capitalized.
For example, the list item = "democratic" will transform into
"Dem". Apply alphabetically sorting to the new
list.
2) Imagine an infinitely long hollow metal pipe with a
rectangular cross section. The four sides are placed at x = −a and
x = a, and at y = −b and y = b. The two sides on the x-axis (and
parallel to the y-z plane) are held at V = 0, the two sides on the
y-axis (and parallel to the x-z plane) are held at a constant
positive potential V = V0. Imagine that each infinite plate...
Describe and sketch a weld cross section including the
weld metal, heat affected zone, and base metal on cold worked
material. In the heat affected zone, make sure to label what is
happening as the distance increases from the weld.
1) What is Compton scattering?
2) Derive an equation for the wavelength of a photon scattered
from a nearly free electron in some target material.
3) Why is Compton scattering not observed for visible
wavelengths?