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pers umum : y = A sin (ωt - kx) --> k = 2π / λ
sehingga pers disederhanakan
a. arah getar dan arah rambat ke sumbu x positif
b. A= amplitudo = 0,03 m
ω = 4/5π --> ω = 2πf , sehingga
2πf = 4/5 π
f = 4/10 Hz
= 2/5 Hz
= 0,4 Hz
jika k = 1/20 π --> k = 2π / λ
sehingga 2π / λ = 1 / 20 π
λ = 40 m
c. v = λ. f
= 40. 0,4
= 16 m/s