1,5 1,5min= 9wyraź w hercah)

1,5/1,5min=1,5/1,5*60s=1/60s=1/60*1/s=1/60Hz

n = 1,5 t = 1,5min = 90s   f = n/t f = 1,5/90s = 0,0(16)Hz ≈ 0,017Hz     ---------------------------------------------------------------------------------------------------- Litterarum radices amarae sunt, fructus iucundiores   Pozdrawiam :)