WHAT OF THE FOLLOWING DEVICES DOES NOT MAKE USE OF ELECTROMAGNETIC WAVES IN ITS OPERATION A CAMERA A LOUDSPEAKER A RADAR STATION AND A RADIO SET?

A camera does not make use of electromagnetic waves in its operation. Instead, it captures light, which is part of the electromagnetic spectrum, but it does not rely on the transmission or reception of electromagnetic waves like a loudspeaker, radar station, or radio set, which all utilize electromagnetic waves to function.