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Frequency and wavelength are inversely proportional to each other. When the wavelength is longer like in the bass guitar it will have a lower pitch. The whistle has a short wavelength so the frequency is higher because the waves are closer together.

Frequency and wavelength have an inverse relationship. A longer wavelength, like that of a bass guitar, results in a lower pitch. On the other hand, a shorter wavelength, such as that of a whistle, leads to a higher frequency because the waves are more closely packed together.