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August 29, 2014

Homework Help: physics

Posted by amy on Friday, December 14, 2012 at 7:07pm.

Radio waves of frequency 30 kHz are received at a location 1500 km from a transmitter. The radio reception
temporarily “fades” due to destructive interference between the waves travelling parallel to the ground and the
waves reflected from a layer (ionosphere) of the earth’s atmosphere.
(i)What is the minimum distance that the reflected waves should travel for destructive interference to occur
at the receiver?
(ii) The layer at which the waves are reflected is at a height h above the ground. Calculate the minimum
height of this layer for destructive interference to occur at the receiver.

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