The variation with frequency 
of the amplitude 
of a transmitted radio wave after amplitude modulation by an audio signal is shown in the figure below.
For this transmission, determine:
the wavelength of the carrier wave
the maximum frequency of the transmitted audio signal.
Another audio signal with the same maximum frequency is transmitted using a different carrier wave frequency. The lowest frequency of this modulated wave is equal to the highest frequency of the modulated wave in (a). Determine the frequency of this carrier wave.
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