Two speakers, in phase with each other, both put out sound of frequency 430 Hz. A receiver is 3.50 m from one speaker and distance x from the other, where x > 3.50 m. What is the smallest value of x such that the receiver detects maximum destructive interference? Take the speed of sound to be 343 m/s.

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.