Answer :
Amplitude and wavelength are the property of the waves. These both are directly related to each other. Thus, option A is correct.
What are wavelength and amplitude?
Amplitude is the measure of the wavelength that is estimated from the peak or crest to the trough of the wave. Wavelength is the measurement of the length of the wave from one peak to the crest of another wave.
Though there is no relationship between the wavelength and amplitude of the waves they can be said to have direct relation as wavelength and frequency are indirectly related.
Therefore, option A. direct relation is correct.
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