wavelength is a property of a wave. The wavelength has nothing to do with the wave particle duality.
Light is said to be particle and a wave as it will behave as one or the other depending on the situation. This is due to the quantum nature of light.
wavelength is the measurement of energy of a photon. The shorter the wavelength the more energy the photon has. Radio waves are very low energy and can have a wavelength of km. Gama rays are extremely high energy photons. They have a wavelength of 10^-11 or 10 picometers and smaller.
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