None of these technologies use radio waves. None of these technologies use lower-frequency microwaves. None of these technologies use higher-frequency microwaves. None of these technologies use infrared waves. The radiation emitted by some wireless local area networks has the shortest wavelength of all the technologies listed above. All these technologies emit waves with a wavelength in the range 0.10 to 10.0 cm. All the technologies emit waves with a wavelength in the range 0.01 to 10.0 km.

If you place a magnet under a clear dish, and sprinkle iron fillings over it, above what part of the magnet will most of the fillings gather

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants