![]() so waves with longer wavelength can penetrate substances better but since they have low frequency, they cannot harm living tissue. that is why radio waves which have a long wavelength like red light are used for satellite communication. than those of short wave or VHF radio, or television. red colour light penetrates water and air the best and can travel the longest. Long wave radio signals are much less affected by buildings, hills, tunnels etc. The greater the wavelength, the greater the diffraction.ĭiffraction affects radio and television signals. The extent of the diffraction also depends on the wavelength of the waves. Waves passing through a wide gap (gap width greater than the wavelength) Waves passing through a narrow gap (gap width less than the wavelength)Ī gap width much larger than the wavelength causes little spreading eg light waves passing through a doorway. The scattering of X-rays from the free surface of liquid water in equilibrium with water vapour has been analyzed at 4, 25, 50, 75, 100, 150 and 200C. The wavelength is unchanged after diffraction.Ī gap width similar to the wavelength of the waves passing through causes a lot of spreading, eg sound waves passing through a doorway. The extent of the spreading (diffraction) depends on how the width of the gap compares to the wavelength of the waves. If you create a water-spray then tiny droplets can produce interference effect (but no diffraction as diffraction requires an aperture of the. Solutions based on the theory of light diffraction have been proposed for water-wave diffraction. This is diffraction - the spreading out of waves when they go through a gap, or past the edge of a barrier. Wave diffraction is an important factor in this behavior. The waves always 'spread' to some extent into the area beyond the gap. ![]() This may seem obvious but what happens on the far side of the gap or barrier is not so straightforward. ![]() ![]() When waves meet a gap or an edge in a barrier, they continue through the gap or past the edge of the barrier. Diffraction of Waves Reflection involves a change in direction of waves when they bounce off a barrier refraction of waves involves a change in the direction of waves as they pass from one medium to another and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path. ![]()
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