Germer) was awarded the Nobel Prize in 1937. A wave doesnt just stop when it reaches the end of the medium. On this page, we will focus on three specific behaviors - reflection, refraction and diffraction. For their experimental validation of DeBroglie’s relation, Davisson (but not poor Mr. In Lesson 1, we will investigate the variety of behaviors, properties and characteristics of light that seem to support the wave model of light. This is crucial in technologies like sonar used in underwater navigation and exploration. When a sound wave generated in air enters water, it bends due to the change in speed, demonstrating refraction. Sound waves travel faster in water than in air. The presence of distinct interference maxima validates the idea that matter has a wave-like nature, and the agreement in lattice spacing illustrates that DeBroglie’s relationship between the momentum and wavelength of matter is correct. Underwater acoustics is a great example of sound refraction. This value agrees with the known lattice spacing of nickel. It diffracts the smaller waves which are incident on it. A mountain reflects most amount of these smaller waves but the tip is small compared to the wavelength. A light wave consists of larger number of smaller waves. This stick bends the water wave which is similar to diffraction. This bending of sound waves is what makes diffraction both fascinating and essential. Compare this to a stick placed in the path of water wave. The wavefronts curve around the obstacle, allowing sound to reach regions otherwise hidden from its path. Yes, sound waves can undergo diffraction, which is why we can hear sounds even when obstacles are blocking the direct path. Inserting this result into the Bragg relation results in When sound waves encounter an edge or obstacle, this motion is disrupted, and diffraction occurs.
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