Mathematical and Physical Journal
for High Schools
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Problem P. 4145. (March 2009)

P. 4145. A passenger train passes a railroad-crossing at a speed of 72 km/h, and it blows a whistle at a frequency of 170 Hz. What is the pitch interval which is sensed by an observer standing next to the railroad-crossing?

(4 pont)

Deadline expired on April 14, 2009.


113 students sent a solution.
4 points:51 students.
3 points:19 students.
2 points:33 students.
1 point:7 students.
0 point:1 student.
Unfair, not evaluated:2 solutions.

Problems in Physics of KöMaL, March 2009