It is because they have wavelengths longer than the acute ones, more or less the dimensions of doors and windows, so they have no problem in being diffracted in them, see the following figure.ĭiffraction also allows people's voices to be heard before seeing them and bumping into them around the corner, as this is the obstacle that diffracts the waves. When you are in a room adjacent to another where music is playing, lower tones are heard better. One person can talk to another even if there is a room in between and we can hear music and voices coming from other places, since the sound wavelengths are of comparable size or greater than everyday objects. The other two characteristic properties are interference and polarization, with refraction and reflection equally applicable to particles of matter. The jet of marbles will continue to move in a straight line, instead of immediately dispersing throughout the available space, as waves do.Definitely the material particles at the macroscopic level do not experience diffraction, but the electrons, even having mass, can.įor this reason, all physical phenomena that are manifested through diffraction must be of the wave type. Imagine for a moment that instead of water it was a stream of marbles that passed through the openings. For example, the tiny particles in the atmosphere act as obstacles for light to diffract, causing rings to be seen around very luminous objects such as light and the sun.įor sound waves, on the other hand, diffraction is facilitated, since their wavelength is of the order of meters, so openings the size of doors and windows are enough for it to occur.ĭiffraction is a unique property of waves.
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