13. For approximately what sound frequency will the phase difference between your cars be 45" if the source of sound is to the side of your head? (The sound travel through air, not your head) A. 50 Hz B. 350 Hz C. 2.0 kHz D. 5.0 kHz11, Three point charges are xed in place in a right triangle. What is the electric force on the O.60-pc charge due to the other two charges? +0.80 uc ",0 A. 4 N B. 29 N C. 1.6 N D. 4.4 N E. 10.1 N