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+//developed in windows XP operating system 32bit

+//platform Scilab 5.4.1

+clc;clear;

+//example 16.23w

+//calculation of the frequency of train whistle heard by the person standing on the road perpendicular to the track

+

+//given data

+v=340//speed(in m/s) of the sound in the air

+d1=300//distance(in m) of the train from the crossing

+u=120*10^3/(60*60)//speed(in m/s) of the train

+nu=640//frequency(in Hz) of the whistle

+d2=400//distance(in m) of the person from the crossing ,perpendicular to the track

+

+//calculation

+theta=acosd(d1/sqrt(d1^2+d2^2))//pythagoras theorem

+nudash=(v/(v-(u*cosd(theta))))*nu//frequency of the whistle heard

+

+printf('the frequency of train whistle heard by the person standing on the road perpendicular to the track is %d Hz',nudash)