{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture 18 - sound waves

lecture 18 - sound waves - Announcements Prayer...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Announcements 2/16/11 Prayer Exams… hopefully graded by Friday Extra time on Lab 3:  now due Tues Feb 22. Monday Feb 21 is President’s Day holiday. Tues Feb 22 is a virtual Monday Remember in HW 17-5b to be very careful to track  the correct peak when plotting it for t = 0.1 s and t  = 0.5 s, and when calculating the velocity of the  peak. 
Image of page 1

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

View Full Document Right Arrow Icon
Thought question A wave at frequency   traveling from a string to a rope.   ω At the junction, 80% of the power is reflected.  How much  power would be reflected if the wave was going from the  rope to the string instead? a. Much less than 80% b. A little less than 80% c. About 80% d. More than 80% e. It depends on the color of the rope. 2 1 1 2 R I A v v r v v A - = = + % % 2 1 2 2 T I A v t v v A = = + % % 2 R r = 1 T R = -
Image of page 2
Demo Reflection at a boundary
Image of page 3

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

View Full Document Right Arrow Icon
Dispersion Summary A dispersive  medium: velocity is different for  different frequencies Any wave that isn’t 100% sinusoidal contains  multiple frequencies. To localize a wave in space or time, you need lots  of frequencies… really an infinite number of  frequencies spaced infinitely closely together.
Image of page 4
Image of page 5
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