If atoms have specific energy levels, why do opaque solids absorb all visible light, not just some? [duplicate]
Here's my question: if atoms have well defined energy levels and those differences correspond to the frequencies of light that can be absorbed, how is it that opaque objects absorb all or most visible ...
What happens at the zone boundaries of the brillouin zones in the tight binding model? How does the band gap originate in the TB model?
Effective mass of a Bloch electron in a periodic potential is negative why ?
Is there any phase transition occur in paramagnetism to diamagnetism transitions state. What should be the order and how will I calculate the order?
A very rough approximation from first principles, from the elementary charge and hbar, would suffice. But is there such an approximation at all? (Alternatively, if water is too difficult: is there ...