রাডারে যে তড়িৎ চৌম্বক ব্যবহার করা হয় তার নাম কি?

Radar is an “active” sensing device in that it has its own Source of illumination (a transmitter) for locating targets. It typically operates in the microwave region of the electromagnetic spectrum— measured in hertz (cycles per second), at frequencies extending from about 400 megahertz (MHz) to 40 gigahertz (GHz). Source:Britannica