Onda acústica

As ondas acústicas são um tipo de propagação de energia através de um meio de compressão adiabática e descompressão.[1] Quantidades importantes para descrever as ondas acústicas são pressão acústica, velocidade das partículas, deslocamento das partículas e intensidade acústica.[2] As ondas acústicas viajam com uma velocidade acústica característica que depende do meio pelo qual estão passando. Alguns exemplos de ondas acústicas são o som audível de um alto-falante (ondas que viajam pelo ar na velocidade do som), o movimento do solo por um terremoto (ondas que viajam pela terra) ou o ultrassom usado para imagens médicas (ondas que viajam pelo corpo).[3]

Propriedades das ondas

Ondas acústicas são ondas elásticas que exibem fenômenos como difração, reflexão e interferência.[4] Observe que as ondas sonoras no ar, no entanto, não possuem polarização, pois oscilam na mesma direção em que se movem. Ondas acústicas de grande amplitude, lançadas por pulsos de laser ultracurtos, podem manipular dinamicamente a resposta óptica dos semicondutores.[5]

Ver também

Referências

  1. ↑ «Adiabatic conditions». www.thermopedia.com. Consultado em 4 de dezembro de 2019 
  2. ↑ «PLANE ACOUSTIC WAVES». Sharif University of Technology. 2017 
  3. ↑ «The Physics Behind Acoustic Waves». UniversalClass.com. Consultado em 4 de dezembro de 2019 
  4. ↑ Louati, Moez; Ghidaoui, Mohamed S. (3 de setembro de 2017). «High-frequency acoustic wave properties in a water-filled pipe. Part 2: range of propagation». Journal of Hydraulic Research. 55 (5): 632–646. ISSN 0022-1686. doi:10.1080/00221686.2017.1354934 
  5. ↑ «Controlling the optical properties of solids with acoustic waves». Tech Explorist (em inglês). 30 de novembro de 2019. Consultado em 4 de dezembro de 2019 


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