Frequency of the square wave were chosen too high?

[xswtxoj]

What would the pattern look like if the frequency of the square wave were chosen too high? and too low?

 

[berkeman]

What would the pattern look like if the frequency of the square wave were chosen too high? and too low?

You will need to describe your question in more detail. Pattern seen on what? A spectrum analyzer? Frequency too high or too low for what?

 

[xswtxoj]

like in a RC circuit, how would the square wave be shaped more like if it was too high or too low?

 

[HallsofIvy]

Your question simple doesn't make sense. A square wave is, by definition, a series of rectangles, no matter how high or low.