Quantum Mechanics Answers

6. A sodium atom is in one of the states labeled ''Lowest excited levels". It remains in that state
for an average time of 1.610-8
s before it makes a transition back to a ground state, emitting
a photon with wavelength 589.0 nm and energy 2.105 eV. What is the uncertainty in energy
of that excited state? What is the wavelength spread of the corresponding spectrum line?

What is hundreds rule for spectroscopic term ordering

What is scattering amplitude in born approximation.

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Write spin multiplicity of spin S=1/2 particle.

A simple model of ammonia consists of a pyramid of hydrogen atoms at the vertices of the equilateral base and the nitrogen atom at the apex. The N-H distance is 0•10 nm and the angle between two N--H bonds is 108
Find the center of gravity of the molecule. (Atomic weights: H N 14;

Describe an experiment to determine the position of the centre of gravity of a flat piece of cardboard cut into the of a triangle. Use the conditions of equilibrium you have stated to justify your practical method.

An electron is accelerated through a potential difference of 12.1 V.
n=5 -0.54eV
n=4 -0.8 eV
n=3 -1.5 eV
n=2 -3.4 eV
n=1 -13.6 eV
(a) How much kinetic energy has it gained in (i) electronvolts (ii) joules? (b) This electron hits a hydrogen atom and excites it. (i) Explain what is meant by excitation