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The extent of the spreading (diffraction) depends on how the width of the gap compares to the wavelength of the waves. The wavelength is unchanged after diffraction.

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Waves cause a disturbance of the medium through which they travel. This allows them to carry energy. The quantity of energy carried relates to the amplitude of the wave.

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When waves meet a gap or an edge in a barrier, they continue through the gap or past the edge of the barrier. This may seem obvious but what happens on the far side of the gap or barrier is not so straightforward.

A gap width similar to the wavelength of the waves passing through causes a lot of spreading, eg sound waves passing through a doorway.

Diffraction affects radio and television signals. Long wave radio signals are much less affected by buildings, hills, tunnels etc. than those of short wave or VHF radio, or television.