Question

A beam of 9 MeV *α* particles scatters from a gold foil
of thickness 0.5 µm.

(a) What fraction of the *α* particles is scattered
between 1° and 2°?

(b) What is the ratio of *α* particles scattered through
angles greater than 2° to the number scattered through angles
greater than 20°?

(c) What is the ratio of *α* particles scattered through
angles greater than 3° to the number scattered through angles
greater than 90°?

Answer #1

What fraction of 5 MeV α particles will be scattered
through angles greater than 12° from a gold foil (Z = 79,
density = 19.3 g/cm3) of thickness 10-8
m?

What fraction of 5 MeV α particles will be scattered through
angles greater than 2.5° from a gold foil (Z = 79, density = 19.3
g/cm3) of thickness 10-8 m?

5. Rutherford scattered a parallel beam of α particles with
fixed kinetic energy from a gold foil and compared the distribution
to that expected from pure Coulomb scattering. What did he observe
and what was he able to conclude from his data?

Consider an incident beam of 10^4, 2.4 MeV photons on a block of
carbon of thickness 3 × 10^23electrons/cm^2(or 5 ×
10^22atoms/cm^2). A. The primary interaction between the
photon beam and the block of carbon is Compton scattering. What is
one way you could determine this? State a useful coefficient for
this interaction. B. What is the number of Compton
interactions? C. How much energy is diverted from the
incident beam? D. Calculate the energy transferred to the
kinetic energy...

II(20pts). Short Problems
a) The lowest energy of a particle in an infinite one-dimensional
potential well is 4.0 eV. If the width of the well is doubled, what
is its lowest energy?
b) Find the distance of closest approach of a 16.0-Mev alpha
particle incident on a gold foil.
c) The transition from the first excited state to the ground
state in potassium results in the emission of a photon with = 310
nm. If the potassium vapor is...

Example 1: Among females in the US in a given age cohort, a
diastolic blood pressure is normally distributed with mean µ = 95
mm Hg and standard deviation σ = 15 mm Hg. a) What is the
probability that a randomly selected woman has a diastolic blood
pressure less than 90 mm Hg? b) What is the probability that she
has a diastolic blood pressure greater than 95 mm Hg? c) What is
the probability that she has a...

Solutions for this exercise will not be posted. However, it is
possible that questions from this
exercise could appear on Midterm II. DEFINE ALL NOTATION!!!!!
1. Here is a pdf:
.
a) How do you know it is a continuous distribution?
b) The constant a is positive. What is a?
c) What is probability that the random variable X is equal to
1?
d) What is F(-0.5)?
e) What is the cdf of the random variable X?
f) What is...

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

Lab 9 – Molecular Biology
In this lab, you will prepare an agarose gel and use gel
electrophoresis to compare the size of 2 dye molecules Methyl
orange and Ponceau G. You will also analyze an “unknown” sample
that contains a mixture of two dyes. Dye molecules with lower
molecular weight or greater electrical charge will migrate faster
through the gel, than dye molecules with greater molecular weights
or lesser electrical charge.
Materials:
Mini gel electrophoresis chamber
6 Tooth comb...

1. A random number generator is used to select a number from 1
to
500 ?(inclusively).
What is the probability of selecting the number 595
?
What is the probability?
2.Identify the sample space of the probability experiment and
determine the number of outcomes in the sample space.
-Randomly choosing an even number between 10 and 20,
inclusive
The sample space is?
(Use a comma to separate answers)
There are _____ outcomes in the sample space
3. Determine the number...

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