Answer:
60 nm
Explanation:
The wave equation applies:
[tex]v = f\lambda[/tex]
where f = frequency
λ = wavelength of the wave
In wave propagation, the wavelength represents one full wave cycle. This is the distance from one crest (peak) or trough (dip) to another crest (peak) or trough (dip). Therefore, a wave or say, 20 nm will have traveled after 3 cycles:
distance = 3 (20nm)
= 60 nm
