A train is moving on a straight track with speed 20 m/s-1
PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A train is moving on a straight track with speed 20 m/s-1. It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound = 320 m/s-1) close to:
(1) 18%
(2) 24%
(3) 6%
(4) 12%