The missing value of the wavelength of air for the given values of wave speed and the frequency is 6.3.
What is wavelength?
The wavelength is the distance between the adjacent crest or trough of the sinusoidal wave. The wavelength is the reciprocal of the frequency of the wave.
Wavelength λ = v/f
where v is the speed of wave = 346 m/s
Cordless phones use a frequency of 55Hz , then the wavelength will be
λ = v/f
λ = 346 m/s / 55 Hz
λ = 6.3 m
Thus, the missing value of wavelengths of the air is 6.3.
Learn more about wavelength.
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