Struggling With Physics: Units of Periods Needed

[altec121]

I've just been introduced to wavelengths and so forth in my Physics class but i was out for 3 weeks and I'm basically expected to do all these equations and homework with no help or anything. Can't contract my professor, it's winter break and I've tried researching but i can't find what the Units of Periods are...please help me.

 

[rock.freak667]

The unit of Period(as in periodic time) is the second

 

[altec121]

thanks