Radar detectors use radio waves to measure the speed of moving vehicles. radar detectors have a wavelength of 1.8 X 10^12 meters. what is the frequency of waves from a radar detector?

C) the periods  of day and night would be fixed all year for anyone at the  equator

Definitely true

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.