JEE Main & Advanced
Sample Paper
JEE Main - Mock Test - 39
question_answer
A train approaching a railway stations crossing at a speed of 120 km/h sounds a short whistle at frequency 640 Hz when it is 300m away from the crossing. The speed of sound in air is 340 m/s what will be the frequency heard by person standing on a road perpendicular to track through the crossing at a distance of 400 m from the crossing -