44 sinus periodes per 100ms??

The "period", T, of a sin wave is the time it takes to start repeating itself, and the sin wave can be written as sin(2π/T)  (that's meant to be sin(2*pi/T) - I'm not keen on the symbol for pi here - it looks a bit like an n!!!).  Presumably you are asking what is T if 44T = 100ms?  If so then T = 100/44ms or

$${\mathtt{T}} = {\frac{{\mathtt{100}}}{{\mathtt{44}}}} = {\mathtt{T}} = {\mathtt{2.272\: \!727\: \!272\: \!727\: \!272\: \!7}}$$  ms