I'm looking at this question: 'If we assume as oscillation of form y = Aexp(iwt) what is the operator w? What then is the operator for frequency f?' I have no idea what is ment by operator. I've tried looking it up in books and the net, but the explinations im finding just aint helping me. Can anyone tell me how to find an answer to this question. (this isnt a homework question btw) Another question (this is a homework question): 'An oscillation of frequency f dies out after approximately 10 seconds. What is the approximate spread of the frequencies.' My question is, what is ment by spread?