The wavelength of a wave varies inversely as its frequency, i.e.
W ∝ 1/F
A wave decreases its frequency from 600kHz to 300kHz, so let's calculate the scaling factor of W due to the change in F.
k = 1/(300/600) = 2
To find the new wavelength, multiply the original wavelength by k:
W = 2×129m
W = 258m
