Question $3$

$($a$)$ In the following figure $($Figure $3),$ consider that this case can be divided into two segments for railway noise assessment. Determine the following correction factors for each segment: $($a$)$ angle of view; and $($b$)$ reflection from opposite fa$$ades$.$

Given:

${}_1=24,{}_2=20,{}_3=22,$ and ${}_4=18.$

Correction for the angle of view $(C_A)=10lo{g}_{10}[\frac{}{180}-cos(2)sin()]-5,$ where

degree