How are scientific theories different than laws or hypotheses? O Theories can be changed to better fit new evidence.
O Theories can remain the same over hundreds of years.
Theories can be proven beyond any doubt or questioning.
O Theories can develop without any supporting observations.

absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas.

emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.

explanation:

it takes about 30 days for it to break down

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.