When the wavelength increases, wave frequency decreases so if the if the wavelength is increased to 10m then the frequency will be decrease at the same rate.
Frequency and wavelength have inverse relationship to each other. The wave with the greatest frequency has the shortest wavelength. If the frequency increases twice it means one-half the wavelength so we can conclude that if the wavelength is increased to 10m then the frequency will be decrease at the same rate.
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