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n = 2
t = 0,4 s
λ = 25 cm . 2
= 50 cm
ditanya =
v = ...
dijawab =
f = n / t
= 2 / 0,4 s
= 5 Hz
v = λ . f
= 50 cm . 5 Hz
= 250 cm/s (c)
a.
lamda = 25 x 2 = 50 cm
b.
f = n/t
f = 2 / 0,4
f = 2 x 10/4
f = 5 Hz
Jawab
v = lamda x f
v = 50 x 5
v = 25 m/s