PHYS 201 Midterm: PHYS 201 TAMU Fall 08 Exam 4 Solutions
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Name (signature as oil id)___________________________________ lab section number. No work needs to he shown. (5 pts) 1. The equation describing transverse waves on a certain string is y(i, t) The speed of these waves is (2. 00 rnm)sin[(200 s)t (30. 0 rn")x]. o: 3. 8 rn/s (c) 2. 12 rn/s (d) 1. 06 rn/s (e) 0. 15 rn/s (f) 6000 rn/s (g) none of the above answers (5 pts) 2. A string is tied down at both ends. The second overtone standing wave has wavelength 0. 60 in. The length of the string is (a) 0. 20 in (h) 0. 30 rn (c) 0. 40 in (d) 0. 60 rn. 99o iii (g) 1. 20 rn (ii) none of the above (5 pts) 3. A listener is moving to the left with a speed 20 rn/s. A train to his right is moving to the left with a speed of 40 in/s. The trains whistle is emitting sound waves with a frequency of 400 hz.
