Re-sampling sentinel-1 images

Hi everyone
I work with windows-7 and Snap-5.
When I do the re-sampling order, i-IW and q-IW bands sizes change but the intensity-IW bands sizes don’t change.
Would you pleas guide me?

you can re-calculate the intensity by this equation: i*i + q*q

How to do this?

right-click on the i or q band and select band maths. There you can define a name and a expression for a new band.