Home » Interference and Filtering » 30 » a A filter used to attenuate a very narrow band of frequencies centred on 3.6 MHz would be called:   a.   a band-pass filter   b.   a high-pass filter   c.   a low-pass filter   d.   a notch filter Your answer "a" is not correct. "d" is the right answer. That was the last question for this topic.