Two speakers c & d are driven in step at 600 hz by the same audio oscillator. these speakers both start out at 5.0 m from the listener, but speaker c is slowly moved away. if c keeps moving, at what distance d will the speakers produce the second destructive interference at the listener? the speed of sound is 340 m/s.

a) 0.97 m

b) 0.86 m

c) 0.45 m

d) 0.28 m

Which describe reflection? check all that apply. light bounces off a boundary.

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical