Atomic and Nuclear Physics Answers

A gamma spectrometer delivers a 10ns pulse of 1Mw average power. If the photons have a wavelength of 694.3nm, how many are contained in the pulse

A star ending its life with a mass of twice the mass of the sun is expected to collapse combining its proton and electron to form a neutron star. If a star of mass 2.0× 1.99×1030kg collapsed into the neutron what would be its radius?

Calculate the time of free fall of an HI cloud of density 10^6
particles/m3
.

Show that the group velocity is zero at edge of the first Briclouin zone for a linear monoatomic chain.

The energy of the lowest allowed level for an electron in a 1-D box is 10.0 eV. Can the electron ever have an energy of 200 eV? Justify.

For a motion of a particle of mass μ in a spherically symmetric potential show that
L²and Lzcommute with the Hamiltonian

Calculate the mean kinetic and potential energies of a simple harmonic oscillator
which is in its ground state.

For the operator A = a x + i b p where a and b are constants, calculate [A, x] and
[A, A].

1kg mass placed on the moon will weigh

Cobalt 60 is used in many applications where gamma radiation is required. The half-life of cobalt 60 is 5.26 years.
a. Find the decay constant
b. If a sample has an initial activity of 2*10^(15) Bq, what will its activity be after 3 years?