a wave propagates in free-spacc with clectric ficld e = | 100e -1220z + 100e +j220z | à (a) show that e satisfies the source-free wave equation (b) what arc the wave's phase vclocity and frcquency?

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.