vmax=ωA=785*4=3140 mm/s=3,14 m/s
v=√(E/ρ)=√(6,75*10¹⁰/2700)=√(6750*10⁷/2700)=√(2,5*10⁷)=5000 m/s
Δφ₁=π/4;Δφ₂=π/3
Δφ₁=2πx/λ=>x=λΔφ₁/2π=λ*π/4/2π=λ/8
Δφ₂=2πy/λ=>y=λΔφ₂/2π=λπ/3/2π=λ/6
L=x+y=λ/8+λ/6=(3λ+4λ)/24=7λ/24
λ=2πv/ω=2*3,14*5000/785=31400/785=40 m
L=7λ/24=7*40/24=280/24=11,666 m
