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l1 = 15 cm
v = 345 m/s
Dit = f = ?
Jawab:
l = (2n - 1) λ / 4
l = (2 .1 -1) λ / 4
l = λ / 4
15 = λ / 4
60 cm = λ
0,6 m = λ
f = v / λ
f = 345 / 0,6
= 575 Hz