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Wave Optics
Question
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What does the negative total energy of electron in its excited state signify?

Answer

The negative total energy of electron in it's excited state signify that the elctron is bound to the nucleus and is not free to leave it. 

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Some More Questions From Wave Optics Chapter

The size of the atom in Thomson's model is _________ the atomic size in Rutherford's model. (much greater than/no different from/much less than)

In the ground state of __________ electrons are in stable equilibrium, while in __________ electrons always experience a net force. (Thomson's model/Rutherford's model).

A classical atom based on __________ is doomed to collapse. (Thomson's model/Rutherford's model)

An atom has a nearly continuous mass distribution in a _____________ but has a highly non-uniform mass distribution in __________ (Thomson's model/Rutherford's model)

The positively charged part of the atom possesses most of the mass in ___________ (Rutherford's model/both the models).

Suppose you are given a chance to repeat the alpha-particle scattering experiment using a thin sheet of solid hydrogen in place of the gold foil. (Hydrogen is a solid at temperatures below 14 K.) What results do you expect?