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340 = 17 / T
20 = 1 / T
T = 1/20
f = 1 / T = 1 : 1/20 = 20 Hz
lamda = 17 m
v = 340 m/s
Ditanya T (periode) dan f (frekuensi)
T = lamda/v
= 17/340
= 0.05 s
f = v/lamda
= 340/17
= 20 Hz
semoga membantu, Tandai sbg solusi terbaik yaa ^^