3. the electric field of a sinusoidal electromagnetic wave has an amplitude of 5.0 v/m. how much radiation energy passes through a 1.5 m2 window perpendicular to the wave during one hour? a) 258 j b) 459 j c) 351 j d) 531 j e) 179 j

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

State one advantage and one disadvantage of using a plane mirrior as a driving mirrior

What is an electric motor? explain its operation. 2-3 sentence