18 - 18 2 18-1 2 1 p 2(wavefront(ray 1 2 3 v= = v = B B 0...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
18장. 파동 2 18-1, 2 소리 (음파), 소리의 속도(음속) 1. 소리의 본질: 공기의 압력 p (또는 밀도 ρ )의 파동, 종파 2. 파면(wavefront)과 파선(ray) 1) 파면: 위상이 일정한 점들이 이루는 곡면 2) 파선: 파면에 대한 법선을 이은 곡선 (에너지가 전달되는 궤적) 3. 소리의 속도 v = B ρ , ( B : 부피 탄성률) ≡  보기: 실(끈)의 파동 전파속도 v = τ μ = 탄성 관성 표. 여러 매질에서의 소리 속도 기체매질 소리속도 (m/s) 액체매질 소리속도 (m/s) 고체매질 소리속도 (m/s) 공기( 0 o C ) 331 물( 0 o C ) 1,402 알루미늄 6,420 공기( 20 o C ) 343 물( 20 o C ) 1,482 강철 5,941 수소 1,284 바닷물 1,522 화강암 6,000
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
18-4 소리의 크기와 준위 1. 소리의 세기 1) 정의: 단위면적에 단위시간동안 소리에 실려 전달되는 에너지 I ( P A ) , ( 에너지전달률 유효전달넓이 ) , 단위: [W /m 2 ] 2) 압력/변위의 진폭과의 관계 I = 1 2 ρ v ω 2 s 2 m = 1 2 p 2 m ρ v
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern