The distance between adjacent crests or troughs in a wave is known as the _____A_____.
_____B_____ is the amount of waves which pass a point in one second

Electromagnetic waves can also behave as particles known as ___A___. The fact that Electromagnetic radiation can behave as both particles and waves is known as ____B____

E = hf is the formula for ___A___.
E=Lhf is the formula for ___B___.

How is an atomic emission spectrum created?

Absorption and Emission spectrum can be used to ___A____ and ___B___ the amount of element in a sample. The intensity of the radiation absorbed is proportional to the ___C___ of the element present.