What diffracts more sound or light4/13/2024 ![]() So, for example, if you had a cubic meter and could way that to find the mass, then you could take that mass divided by the volume to find the density this is used were using the Greek letter wrote to designate this. So that's gonna be masked in a particular volume. What this is is B is the bulk module ISS, which is a measure of how much you can compress the material, how much you can compress the fluid and how hard it will push back. So how do we deal with this? Um, well, as before, the speed of sound speed through which it travels through this is dependent on the material it travels through. We still have lambda and we still have a frequency. So high pressure, low pressure, high pressure, low pressure, high pressure. ![]() We squeeze particles together to reduce the pressure, we pull particles away from each other. It's known as a longitudinal wave, because what we're doing is to increase the pressure. Okay, so this is a pressure wave that travels through the system. So you have high pressure and low pressure around not zero, but some central standard pressure peanut that it was already at before the wave traveled through it. If I were to draw pressure as a function of position here or a time even because remember, it's a function of both, it would oscillate like this. So you have a band of high pressure, then you have a band of low pressure, and it's not a discreet step here like I'm drawing. Um, sound can also travel through liquid to in fact, though, eh? So we're just gonna say that sound travels through fluids, Okay, so sound waves travel through fluid, and what they do is that they're actually an alternating high pressure low pressure system. So what is the medium that sound travels through? Well, usually it's air. The first we're going to think about is sound waves, sound waves. So you maybe haven't thought of in this context. Um and they're both things you've seen before. For the most part the wavfronts are not affected and continue to propagate in the direction of the rays, much like a beam of particles.īecause the wavelength of light is so small (400 to 700 nanometers for visible light), the diffraction of light around real world size obstacles and aperatures is very slight, explaining why for so long light was not thought of as having wave-like properties.Welcome to the next section in traveling waves in this section, we're going to consider to new materials that we're gonna have waves propagating through. If the aperature is much larger than the wavelength, there is not much diffraction, and only the edges of the wavefronts bend slightly. If the aperature is around the size of the wavelength, or smaller, the waves spread out on the other side of the obstacle as if originating from a point souce in the aperature. Waves always bend around an aperature, however, the amount of diffraction depends on whether the aperature size is large or small compared to the wavelength. When a wave encounters a barrier with a small aperature, relative to its wavelength, it bends/diffracts and spreads out in a circular wave. When a beam of particles encounters a barrier, it either is stopped by the barrier, or passes through the aperature cleanly without any change in direction The bending of waves around corners that occurs when a portion of a wavefront is cut off by a barrier or obstacle.
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