Answer Happy

Question 13 (5 points) » Listen Elecpatra suggested having more allies, and urged you to call your PHY143 instructor. Reluctantly, you agreed. When your instructor came to your house, she was approaching straight at you on a very fast-moving car and was frantically making a monotone sound with a pipe with one open end and one closed end, whose length was 0.67 m. According to her text message, she was making the 7th harmonic. But to you, it sounded like the sound was in its 9th harmonic. How fast was she moving? Use 343 m/s for the speed of sound. 98 m/s 76 m/s 270 m/s 440 m/s