## Fundamentals of Physics Study Set 2

Physics & Astronomy

## Quiz 40 :

All About Atoms

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Q32 Q32 Q32

Electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by , , where n

_{x}and n_{y}are integers.At most the number of electrons that can have energy 8(h^{2}/8mL^{2})is:Free

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Q33 Q33 Q33

Five electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n

_{x}and n_{y}are integers.The energy of the ground state of the system isFree

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Multiple Choice

Q34 Q34 Q34

Five electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n

_{x}and n_{y}are integers.The energy of the first excited state of the system is:Free

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Multiple Choice

Q35 Q35 Q35

Electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n

_{x}and n_{y}are integers.The number of single-particle states with energy 5(h^{2}/8mL^{2})is:Free

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Multiple Choice

Q36 Q36 Q36

Six electrons are in a two-dimensional square potential energy well with sides of length L.The potential energy is infinite at the sides and zero inside.The single-particle energies are given by where n

_{x}and n_{y}are integers.If a seventh electron is added to the system when it is in its ground state the least energy the additional electron can have is:Free

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Multiple Choice

Q76 Q76 Q76

Electrons in a certain laser make transitions from a metastable state to the ground state.Initially there are 6 10

^{20}atoms in the metastable state and 2 10^{20}atoms in the ground state.The number of photons that can be produced in a single burst is about:Free

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Multiple Choice