The power Spectral Density(PSD) of a white noise is constant over the whole frequency range. The noise power of a white noise is defined over a specified bandwidth.
The 'Noise Power' parameter specifies the PSD of the white noise.This is in terms of 
. The noise RMS (in V) can be found by calculating the square root of the above value:
. The noise RMS (in V) can be found by calculating the square root of the above value:
= 
The white noise is defined over the complete spectrum.The 'Band Pass Filter' of cutoff frequency 100Hz and desired bandwidth is used for setting the specific frequency.
Kindly refer to the below documentation of “Band Limited White Noise” for more details: https://in.mathworks.com/help/releases/R2024a/simulink/slref/bandlimitedwhitenoise.html?searchHighlight=band%20limited%20white%20noise&s_tid=doc_srchtitle
I hope this helps!
