PHYS 201 Midterm: PHYS 201 TAMU 201Fall 09 Exam 4
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Name (signature as on id)__________________________ lab section number. No work needs to be shown. (5 pts) 1. A train is due east of a listener and is moving east, away from the listener, with a speed of 10 rn/s relative to the ground. The listener is also moving east, toward the train, with a speed of 20 m/s relative to the ground. The train"s whistle is emitting sound waves with a frequency of 500 hz. The frequency of sound heard by the listener is (a) 500hz (b) greater than 500 hz (c) less than 500 hz. A pipe is open at one end and closed at the other end. The first overtone standing wave for the pipe has frequency 680 hz. The speed of sound in air is 340 rn/s. What is the length of the pipe? (a) 0. 125 m (b) 0. 250 m (c) 0. 375 m (d) 0. 500 m (e) none of the above answers (5 pts) 3.
