A team of scientists is designing a radar as a probe formeasuring the depth of the ice layer over the Antarctic land mass.To measure a detectable echo due to the reflection by the ice-rock boundary, the thickness of the ice sheet should not exceed three skin depths. If εr'=3 andεr"=10-2 for ice and if the maximumanticipated ice thickness in the area under exploration is 1.2 km,what frequency range is usable with the radar?