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A locomotive approaching a crossing at a speed of 80 miles per hr sounds a vessel of frequency 400 Hz.When 1 mile frm d crossing there's no wind and the speed of sound in air is 0.2mile per sec.What frequency is heard by an obsercer 0.6 mile frm d crossing on d straight road which crosses rail road wid 90°?
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7 Answers
33A locomotive approaching a crossing at a speed of 80 miles per hr sounds a vessel of frequency 400 Hz when 1 mile frm d crossing, there's no wind and the speed of sound in air is 0.2mile per sec. What frequency is heard by an obsercer 0.6 mile frm d crossing on d straight road which crosses rail road wid 90°?
33
now its simple doppler effect
f=f0c/(c-v.cosθ)
c= speed of sound..
v=speed of train
θ can be calculated in rt triangle..