A proton in an atomic nucleus is bound to other protons and
neutrons in the nucleus by the strong nuclear force when it is
within approximately 3 fm of another particle. What is the
approximate kinetic energy of a proton that is localized to such a
region? What would be the corresponding energy of an electron
localized to within such a region? Compare this to typical beta
energies for beta decay. Is a release of electrons
Part A
1.How does a Geiger-Muller counter detect
radioactivity?
Match the words in the left column to the appropriate blanks in
the sentences on the right. Make certain each sentence is complete
before submitting your answer.
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passing through
conduct electricity
counting
detecting
instant
argon gas
liquid
electrodes
collide with
neon gas
ionize
The Geiger-Muller counter is an------method of
-----radioactivity that is based on the radioactive particle---- a
chamber of----. The radioactive particles-----part of the-----,
which can then----across -----...
A nucleus has atomic mass of 144. In which of the following
cases could the nucleus be stable?
A) The nucleus may be stable if it has between 73 and 83
protons.
B) The nucleus may be stable if it has between 144 and 288
protons.
C) The nucleus may be stable if it has between 83 and 144
protons
D) The nucleus may be stable if it has more than 288 protons
E) None of the the cases described...
What is natural radioactivity? Speak to the different types of
radiation that an unstable nucleus may emit, and the different
types of radiation involved.
Why is it important to be able to write a balanced nuclear
equation for radioactive decay? Go into some of the specifics of
what is involved in writing an equation.
What is a “half-life” and why is it important to know the
half-life of a radioisotope? List a few applications of how
scientists make use of...
What fraction of the α particles in Rutherford's gold foil
experiment are scattered at large angles? Assume the gold foil is
two layers thick, as shown in the figure, and that the approximate
diameters of a gold atom and its nucleus are 1.5 Å and
1.5×10−4Å,
“Atomic fission” is when a nucleus gets hit by a neutron and
splits in half, releasing a great deal of energy. It is the basic
principle behind nuclear reactors and nuclear weapons. The “Fat
Man” atomic bomb dropped on Nagasaki in 1945 had a plutonium core
of 6.4 kg of the isotope Pu-239. (Note that “239” is the molar
mass.) When the bomb exploded, it released an amount of energy
equivalent to 21 kilotons of TNT.
Although the bomb needed...
when firing a proton (for example) to an atomic nucleus, from a
distance D, the deflection angle of the proton ? to the type of
changes atomic nuclei? or always constant?
An atomic nucleus of mass m traveling with speed v collides
elastically with a target particle of mass 2m (initially at rest)
and is scattered at 90°. (a) At what angle does the target particle
move after the collision? (b) What are the final speeds of the two
particles? (c) What fraction of the initial kinetic energy is
transferred to the target particle?
1. A one-electron atom has atomic number ?, mass number ? and a
spherical nucleus of radius ? . Assume electric charge +?? is
uniformly distributed throughout the volume of
the nucleus. Ignoring spin, use first order non-degenerate
perturbation theory and the
hydrogenic wave functions adapted to the one-electron atom to
determine the dependence
of the ground state energy of the atom on ?
An atomic nucleus initially
moving at 420m/s emits an alpha particle in the direction of its
velocity, and the new nucleus slows to 346m/s. If the alpha
particle has a mass of 2u and the original nucleus has a mass of
222u, what speed does the alpha particle have when it is
emitted?
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