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n = 60 kali
t = 0,5 menit = 0,5 x 60 = 30 s
dit : T dan F ?
dijwab :
T = t/n
= 30/60
= 1/2 s
F = n/t
= 60/30
= 2 Hz
atau cara lain cari f = 1/T
= 1/ 1/2
= 2 Hz