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+//developed in windows XP operating system 32bit

+//platform Scilab 5.4.1

+clc;clear;

+//example 16.19w

+//calculation of the frequency of the whistle of the train

+

+//given data

+us=72*10^3/(60*60)//speed(in m/s) of the train 1

+u0=54*10^3/(60*60)//speed(in m/s) of the train 2

+nu=600//frequency(in Hz) of the whistle

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

+

+//calculation

+nudash=((v+u0)/(v-us))*nu//frequency heard by the observer before the meeting of the trains

+nudashdash=((v-u0)/(v+us))*nu//frequency heard by the observer after the crossing of the trains

+

+printf('the frequency heard by the observer before the meeting of the trains is %d Hz',round(nudash))

+printf('\nthe frequency heard by the observer after the crossing of the trains is %d Hz',round(nudashdash))