When the aperture is larger than the wavelength most waves pass through and little diffraction occurs and when the aperture is much smaller than the wavelength most waves are blocked. Sound waves have a wavelength of 1.72 × 10-2 17 m so would not be diffracted by the diffraction grating Radio waves have a wavelength of 0. The size of the aperture (or object) determines the extent of diffraction, with the most significant diffraction occurring when the aperture is of the same order of magnitude as the wavelength of the wave. For diffraction to occur, the slit width should be comparable to the wavelength of the light or sound waves. Diffractionĭiffraction is the spreading out of a wave when it passes through an aperture (gap/hole) or around an object. Hint: The reason for the diffraction of sound waves being more evident in daily experience than light waves is that sound waves have much higher wavelength compared to the visible light waves. IMPORTANT NOTE: If a wave enters a medium at 90º to the surface (parallel to the normal) it is not refracted.
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