1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Radius of circular impulse wave in the hemisphere bowl

  1. Jul 7, 2014 #1
    1. The problem statement, all variables and given/known data

    hi all, why the wave is reflected back form the centre when it is at the distance of 200mm? why the wave cant go beyond 200mm to reach 250mm from the side of bowl?

    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jul 7, 2014 #2

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Can you describe the shape of the wavefront just after tapping the side of the bowl? I'm not sure, but you might have a misconception about this. If in doubt, try it in the kitchen :smile:

    What does the wavefront in the problem look like at t = 0.8 s?
     
  4. Jul 8, 2014 #3
    the wavefront move until the another end from one end and reflect back.
     
  5. Jul 8, 2014 #4

    Nathanael

    User Avatar
    Homework Helper

    So you're saying it would be like a line moving across the bowl and then back?
     
  6. Jul 8, 2014 #5
    Yes. Is it wrong?
     
  7. Jul 8, 2014 #6

    NascentOxygen

    User Avatar

    Staff: Mentor

    It does seem wrong to use the word "reflect" to describe the wave progressing through the centre of the bowl. There is no discontinuity in the medium there for a wave to "reflect" off.

    There is no phase inversion, yet they imply it can be viewed as 100% "reflection"?
     
  8. Jul 8, 2014 #7

    TSny

    User Avatar
    Homework Helper
    Gold Member

    Did you do the experiment?

    Here is what I observed. Picture A shows the water sitting still in the bowl before tapping the bowl.

    B, C, and D show times just after tapping the bowl on the left with the handle of a knife.
     

    Attached Files:

  9. Jul 10, 2014 #8
    sorry i cant understand your photo here. can i still say that the water the wavefront move until the another end from one end and reflect back. which means the water wave can move until 400mm from one end and then only reflect back? which is also (assuming the water wave is produced at the left ) means the water wave is at 150 mm form the right...
     
  10. Jul 10, 2014 #9

    Nathanael

    User Avatar
    Homework Helper

    As you can see from TSny's pictures, that is not what happens. (It is not a line; what shape is it?)
     
  11. Jul 11, 2014 #10
    Circular waves spread out?
     
  12. Jul 11, 2014 #11

    NascentOxygen

    User Avatar

    Staff: Mentor

    Perhaps you could write a few sentences in response to those trying to help you? By confining yourself to a single staccato phrase, you have misled some into thinking you can't conceive of circular wave propagation. Well. I think you have managed it, anyway ...

    Maybe I'm the one who's got it wrong. You have tried tapping on the side of a bowl of water?
     
    Last edited: Jul 11, 2014
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Radius of circular impulse wave in the hemisphere bowl
Loading...