Data:
ΔS = 60cm
Δt = 3s
Vm = ?
Vm = ΔS/Δt
\(Vm = \frac{60}{3}\)
\(Vm = 20cm/s\)
We have:
Vm = v
ΔS = λ
Δt = T
\(v = \frac{\lambda}{T}\)
\(20 = \frac{\lambda}{4}\)
\(\lambda = 20*4\)
\(\lambda = 80cm\)
Soon:
\(v = \lambda*f\)
\(20 = 80*f\)
\(80f = 20\)
\(f = \frac{20}{80} simplify( \frac{\div20}{\div20} )= \frac{1}{4}\)
\(\boxed{f = 0,25Hz}\)
