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  1. V

    B Ripple tank dispersion

    Thank you. You are right. The relationship between frequency and speed in the book is completely opposite with our current knowledge. And I don't want to get into the maths of it. Because I took quite a break from that mathematics. It's hard to come back. Moreover, there are no people in front...
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    B Ripple tank dispersion

    First of all, let me say that this book was at high school level and that it was first published in 1959. (https://en.wikipedia.org/wiki/Physical_Science_Study_Committee) The book doesn't talk about the depth of the water. It states that when the frequency increases, the angle of refraction...
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    B Ripple tank dispersion

    We said that the propagation speed in deep water depends on the wavelength. If we increased the frequency, the wavelength will be shorter. So the speed will also change. This is not wrong, I suppose. It was the water waves mentioned in the book. Anyway, what I'm trying to understand is just the...
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    B Ripple tank dispersion

    Thank you. No, I won't. Just thought exercise. That pdf file is great. Thanks for that. And yes, I don't need horrible equations. I think, understood it. Just one question. Let's consider a giant vibration tank with a sufficient depth and a constant depth. Even a motor that can vibrate at a...
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    B Ripple tank dispersion

    Unfortunatly. I don't have a ripple tank. As I understand, shallow waters aren't dispersive. When it comes to deep water, it is dispersive. In deep water, the group velocity is equal to half the phase velocity. In deep water the phase speed increases with the wavelength, and with the period...
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    B Ripple tank dispersion

    Thanks but can you please simplify a little? That is a little complicated for me.
  7. V

    B Ripple tank dispersion

    Because refraction angle is changed. So the speed also. According to Snell Law.
  8. V

    B Ripple tank dispersion

    Consider water waves refraction in a ripple tank. What happen if we increased the ripple frequency. I mean the refraction angle would change or not? Also, propagation speed will change or not? I had seen a photograph in PSSC Physics. According to that, the refraction angle was reducing if we...
  9. V

    Concave mirror + Glass block

    Definetly. I assumed, that stays the same place and the block as a rectangular prism.
  10. V

    Concave mirror + Glass block

    Ah! I got it. You meant that the separation between the block and mirror should be parallel to both surfaces. Thank you very much. Greatly apreciated.
  11. V

    Concave mirror + Glass block

    Is this? (Sorry, I'm taking your time)
  12. V

    Concave mirror + Glass block

    Slightly big seperation but is it ok?
  13. V

    Concave mirror + Glass block

    Is it correct? I can not draw ray diagrams for the second one (105 cm).
  14. V

    Concave mirror + Glass block

    Homework Statement A glass block of thickness 60 cm and refractive index 4/3 is placed in front of a concave mirror. A light source is then placed on the center of curvature of the concave mirror. Find the position of the final image formed. (Focal length is 30 cm) Homework Equations...
  15. V

    Ripple tank - strobe frequency

    Thank you very very much. Again, thanks for your time. Greatly appreciated.
  16. V

    Ripple tank - strobe frequency

    Thank you very much. Thanks for your time. Those videos are beautiful. We are perceiving the bird and cage at the same place and time. Then we will perceive crest and troughs at the same place in case of fs = 2 fw. Else the wave flicking forth and back at 1/2λ steps?
  17. V

    Ripple tank - strobe frequency

    Which is correct? - Impossible to freeze the waves at fs = 3 fw - Impossible to observe the wavelength as λ/3 - both
  18. V

    Ripple tank - strobe frequency

    You mean, wavelength doesn't change. Does it mean, we don't perceive it as different length too? Honestly I didn't see such a different wavelength but had read it somewhere. For fs = 1/2 fw , the wave would advance two wavelengths between successive looks. For fs = 1/3 fw , the wave would...
  19. V

    Ripple tank - strobe frequency

    I can not answer this. Because can't imagine. Just a guess, the new wave length would be (λ /2). I can not imagine stationary waves for a slot frequency which is higher then the wave frequency. I think, the biggest slot frequency is equal to wave frequency to observe stationary waves. I mean...
  20. V

    Ripple tank - strobe frequency

    Thanks for guide. OK, if the stroboscope (slot) frequency were 24 Hz and the frequency of plane waves were 12 Hz then the waves would be late a half of period. I think would see both crest and troughs of wave alternately.
  21. V

    Ripple tank - strobe frequency

    Homework Statement Say we are observing plane wave patterns on table. The depth of water is the same everywhere in ripple tank. The frequency of waves is 12 Hz and wave length is L (lamda). We see the wave pattern as stationer while looking at wave pattern through the slots of stroboscope which...
  22. V

    Determining proper time

    Thank you. Yes I agree. There are events and observers for each frame but the reason of asking the question is, I am having difficulty to determining the frame of events (and observers). How do I know in which frame the events happening in this example question? If this is not an assumption...
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    Determining proper time

    I hope you'll get better soon. July is not so far. Thank you again. Regards
  24. V

    Determining proper time

    Thank you. Then in this question C1' is the clock which present at both events. Is this what you mean?
  25. V

    Determining proper time

    Thanks for your help. Unfortunatly don't know drawing a diagram in this subject. And.. :( Trying to understand.. The events happening(space coordinates) in the stationary frame(S) is it? And the observer is in moving frame(?!). Are these true? By the way, this question is from Fundamentals Of...
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    Determining proper time

    Hi, I hope asking in right forum. I'm trying to understand proper time concept but I'm afraid couldn't understand the reason of answer for below question. "Figure 37-18 shows two clocks in stationary frame S (they are syncronized in that frame) and one clock in moving frame S'. Clocks...
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    Time dilation and twins paradox

    :) I believe with all my heart. Honestly I couldn't notice this. Big thanks again.
  28. V

    Time dilation and twins paradox

    harrylin thank you very much. I think to my disappointment, the thing you point out about tick count and duration between two tick difference. Now something more clear and by the way need to think this a bit too. Regards
  29. V

    Time dilation and twins paradox

    Thank you harrylin. Especialy your last message was helpful. Now I want to understand the relation between time dilation and twin paradox (difference or what it is). Above in question #2, T3>T4. Can we say someone in spaceship grow old T3 and the other on Earth grow old T4? If this is true...
  30. V

    Time dilation and twins paradox

    Assume a pendulum on Earth swinging and an observer in moving spaceship measuring the period. In this case the pendulum is moving with respect to observer. Thus the observer(in spaceship) will measure the period shorter. This is what I understand from quoted part. Perhaps I misunderstood. Let...
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