A train moves twrds a stationary observer wid a speed of 34 m/s the train sounds a whistle and its - Physics - Waves

Question

A train moves twrds a stationary observer wid a speed of 34 m/s the
train sounds a whistle and its frequency registered by observers
is'f1' II train speed is reduced to 17 m/s ,d frequency is found to
be 'f2' if d speed of sound is 340m/s,den find f1/f2

Neha Gupta · Accepted Answer

let f is the actual frequency 
when train approaches to the observer, then aaparent frequency is given by:f1 = VV-Vtf = 340340-34fwhere V is the velocity of sound
Vt = velocity of trainf2 = VV-Vtf = 340340-17ff1f2 = 340340-34f340340-17f = 323306

A train moves twrds a stationary observer wid a speed of 34 m/s.the train sounds a whistle and its frequency registered by observers is'f1'. II train speed is reduced to 17 m/s ,d frequency is found to be 'f2'.if d speed of sound is 340m/s,den find f1/f2