A train is travelling along a straight, horizontal section of track. The driver sees a maintenance worker ahead of the train on the track and so applies the brakes and the train decelerates. The driver also sounds a horn attached to the front of the train. The horn emits a note of constant pitch.
As the decelerating train approaches the worker, which of the following statements is/are correct?
The pitch of the note heard by the worker is decreasing.
The period of the sound wave heard by the worker is less than the period of the sound wave heard by the driver.
3.The sound wave approaches the worker at a speed that is decreasing.
A none of them
B 1 only
C 2 only
D 3 only
E 1 and 2 only
F 1 and 3 only
G 2and 3 only
H 1, 2 and 3
The answer is E.
What I don’t understand is period is inversely proportional to frequency.
The farther the distance, the lower the f so T should be bigger. Why is 2 correct?