"<span lang="ur">ہرٹز</span>[[ گٹھ:مضامین جنہاں وچ اردو بولی دا متن شامل اے ]]" دیاں دہرائیاں وچ وکھراپا

[[ImageFile:FrequencyAnimation.gif|thumb|left|150px|Three flashing lights, from lowest frequency (top) to highest frequency (bottom). f is the frequency in Hertz ("Hz"), meaning the number of flashes per second. T is the period in seconds ("s"), meaning the number of seconds per flash. T and f are [[reciprocal (mathematics)|reciprocals]].]]