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.

Hydrogen and helium are both members of?

What is special about a dc circuit ?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?