Here's why:
* Diffraction is the bending of waves around obstacles or through openings.
* Wavelength is the distance between two consecutive crests or troughs of a wave.
The relationship is:
* Shorter wavelengths diffract less. Think of light waves: blue light has a shorter wavelength than red light, and blue light diffracts less than red light.
* Longer wavelengths diffract more. Sound waves, with their longer wavelengths, can diffract around corners more easily than light waves.
In summary, the smaller the wavelength of a wave relative to the size of the obstacle, the less it will diffract.
