Two waves have the same speed, but Wave A has twice the wavelength of Wave B. How do their frequencies compare?

The formula we should be using here is v=λ*f, which is f=v/λ.

vA=vB, λA=2λB, so fA=vA/λA=vA/2λB, fB=vB/λB.

Thus fA=(1/2)fB, which means frequency A is half of frequency B.

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