Absorbed energy is said to be quantized. This means: a) Energy is absorbed only by valence electrons. b) Energy causes electrons to be ejected from atoms. c) Energy is absorbed in exact amounts that correspond to differences in energy levels. d) The wavelength of energy absorbed and emitted must be the same. e) Electron promotion by UV/Visible radiation is possible.

Energy is absorbed in exact amounts that correspond to differences in energy levels.

Explanation:

According to Bohr's theory, an electron moves from a lower to a higher energy level when it absorbed photon of a given energy. The energy of the photon absorbed must be equal to the energy difference between the higher and lower energy level. Thus energy is absorbed only in discreet amounts that correspond to differences in energy levels. Absorption of energy in discreet amounts is what is meant by the term 'quantization'.

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.