Question

Calculate the Bragg Scattering angle form [110] plane of a crystal of strontium at room temperature (300K).

Answer #1

In an x-ray diffraction experiment, the first order Bragg peak
from x-rays scattering from crystal planes parallel to the surface
is observed at θ = 34.0. The lattice constant (distance between
atoms) is 0.347 nm. (a) (5 pts) What is the wavelength of the
x-rays? (b) (5 pts) Suppose there is a set of atoms that form
crystal planes that makes an angle of 45 degrees with the surface
of the crystal. Using the wavelength from (a), at what angle...

3. Calculate the glancing angle at (110) plane of a cubic
crystal having axial length 0.26 nm corresponding to the second
order diffraction maximum for the X-rays of wavelength 0.065
nm.

When recrystallization fails
to occur at room temperature adding a seed crystal or scratching
the side of the flask tends to cause crystals to form. Why would
this happen?

The crystal plane spacing of α-Fe varies from 0.202 nm (110),
0.117 nm (211), 0.090 nm (310), 0.076 nm (321), If Kα rays with a
wavelength of 0.194nm irradiate the α-Fe, how many crystal surfaces
can be diffracted? (10 points)

110 mL of H2O is initially at room temperature (22∘C). A chilled
steel rod at 2∘C is placed in the water. If the final temperature
of the system is 21.3 ∘C, what is the mass of the steel bar?

A volume of 110. mL of H2O is initially at room temperature
(22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water.
If the final temperature of the system is 21.20 ∘C , what is the
mass of the steel bar? Use the following values: specific heat of
water = 4.18 J/(g⋅∘C) specific heat of steel = 0.452 J/(g⋅∘C)

Can
you calculate the speed of sound knowing the temperature of the
room and explain in detail

5. (a) Calculate the conductivity of intrinsic Si at room
temperature. (b) Calculate the conductivity of Si doped at
Nd=1017/cm3. (c) Calculate the
conductivity of Si doped at
Na=1017/cm3. (d) Why are the
results different and does this result suggest electron or hole
dope Si may be preferred for some devices? (e) Calculate the
position of the Fermi energy of the three cases described in (a)
–(c).

Q:
(i) Neutron wavelength: Calculate the wavelength of thermal
neutrons at (a) room temperature and (b) cooled to 4 K (liquid He
temperature). How do these compare with 400 keV electrons and to
typical Brehmmstrahlung radiation from an x-ray tube
(ii) Thermal velocities, de Broglie wavelength: A thermal
neutron has a kinetic energy of 3/2 kT, where T is room
temperature, 300 K. i.e. these neutrons are in thermal equilibrium
with their surroundings. (a) Calculate the thermal velocity of such...

A)
Calculate how much energy is required to heat 20.0 mL of water from
room temperature to 40.0 celcius and
B)how much energy is released when 20.0mL of water is cooled from
the initial temperature to 10.0 celcius.

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