The diffraction effect can be observed in

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(D) Diffraction is a general characteristic of all types of waves, including mechanical waves (like sound) and electromagnetic waves (like light). For

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Sound as well as light waves

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(D) Diffraction is a general characteristic of all types of waves, including mechanical waves (like sound) and electromagnetic waves (like light). For diffraction to be significant, the size of the obstacle or aperture must be comparable to the wavelength of the wave. Since sound waves have wavelengths in the range of centimeters to meters, they easily diffract around common obstacles. Light waves have very small wavelengths (in the range of $400 \, nm$ to $700 \, nm$), so they require very small apertures or obstacles to exhibit observable diffraction. Therefore, the diffraction effect can be observed in both sound and light waves.

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