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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. sir it is closed at both sides
    6 years ago by shahid rahman

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  2.  
    3. Sir what is the difference between a stationary wave and a simple harmonic wave?As in both the med. particles execute SHM
    6 years ago by prahas ranjan

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  3.  
    4. sir for physics paper of aiims exam, is advance illustration necessary?
    6 years ago by Ayush Agrawal

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  4.  
    5. sir ke tuning fork ke frequency at 0 degree different nahihoge???
    6 years ago by shahid rahman

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  5.  
    6. If equation of a wave is Y=A sin(wt±k1x±phi) and we know that phi=(2p/lambda)×x or k2×x, then we could have put the wave equation as Y=A sin(wt±(k1±k2)×x). Then what is the use of the first equation, i.e. Y=A sin(wt±k1×x±phi)?
    7 years ago by Aishwarya Jee
    Ans 1 ->
    That 2p is 2p.. or 2 pi
    7 years ago by Aishwarya Jee

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  6.  
    7. In organ pipe questions do we need to use end correction if it isn't mentioned in the question?
    7 years ago by Shivanshu Khajuria

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  7.  
    8. Sir,in this lecture you put coskx=0 for minimum value of R instead of putting coskx=-1.Why?Plz explain me. Thank you
    7 years ago by Dharamjeet Singh

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  8.  
    9. How anitnode is formed in hamering a rod clamped at a position
    7 years ago by kartikey bisht

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  9.  
    10. Sir, I have a doubt. At 1:30 you mentioned that as the medium particles outside the organ pipe scatter the density decreases. That part I got sir. But right after that you mentioned that speed of sound increases? This happens to be my doubt. Sir, sound is a longitudinal wave. It requires a material medium for propagation. So as the density of the medium decreases the number of particles in the vicinity, which were to carry the sound wave (or the disturbance or energy) decreases. This only implies that the speed of sound should increase sir. So should the speed of sound decrease or increase sir? Please forgive me if I am wrong sir.
    7 years ago by Ekansh Verma

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  10.  
    11. Sir, in the final expression for reflection coefficient, if v1>v2, we get a negative coefficient giving negative reflected amplitude. Is there any significance to this?
    7 years ago by Kishore Sathia

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  11.  
    12. At the air-water boundary, sound passes from air to water ie. from low velocity to high velocity. ie. The reflected wave that later constitutes stationary wave is in the same phase forming constructive interference. WHY is there NODE formation at the boundary? (Don't tell me air can't vibrate on the boundary so the node is formed, explain on the basis of reflectance coefficient)
    7 years ago by Rupesh Koirala

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  12.  
    13. i am not able to understand 4th point at please explain to me
    8 years ago by raghav dhamani

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  13.  
    14. please answer my query sir.
    8 years ago by Rohan Meena

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  14.  
    15. why in the last case v1 is less
    8 years ago by Rohan Meena
    Ans 1 ->
    please answer my query sir.
    8 years ago by Rohan Meena

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  15.  
    16. sir why did you take wave eqn to be sin(wt) rather than sin(wt+kx)?
    8 years ago by Hardik Grover

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  16.  
    17. HOW IS displacement node is a pressure antinode ?? couldn't understand clearly
    8 years ago by Pratyush Ranjan Roul

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  17.  
    18. Sir in which plane prongs of the tuning fork are kept (vertical or horizontal w.r.to resonance tube) ? (I have never see this experiment live!)
    8 years ago by

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  18.  
    19. sir i have a basic doubt. sir in this video we can see that in the transmitted wave angular wave no changes from k1 to k2 sir so how come is the transmitted wave in same phase with incident wave?
    8 years ago by Ajay Vashishtha

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  19.  
    20. Sir in the above example while the energy is being damped the frequency would also keep on decreasing as energy is proportional to second power of frequency. Then an instant would come at which the frequency reduces to 10 Hz from 15 Hz and at that time it would resonate and hence oscillations would not stop. Then how would oscillations stop as you told?
    8 years ago by Mridul Singhal

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  20.  
    21. is thw wayer overflowing from reservoir if not then what happens to water when you lower the reservoir down
    8 years ago by Vansh Mishra
    Ans 1 ->
    it overflows and falls down in the water collection tray when it is lowered down... I think you have not seen it in your physics lab...
    8 years ago by Physics Galaxy

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  21.  
    22. sir can we adjust the length between left tied end and the first clamp to find wave speed ?
    8 years ago by ramana sharma g
    Ans 1 ->
    clamps are movable so can be placed anywhere on the box... but to find wave speed imp is the length between the two clamps in experiment where resonance occurs...
    8 years ago by Physics Galaxy

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  22.  
    23. SIR i did not understand the point how all particles between two successive node oscillate in same phase?
    9 years ago by jeevan99
    Ans 1 ->
    Same phase implies parallel oscillations... again consider a string clamped between two supports, if we pluck and release this string... you can imagine that all particles of the string will oscillate parallel to each other with same period but different amplitude... which is same phase oscillation of all particles between two successive nodes...
    9 years ago by Physics Galaxy

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  23.  
    24. but how can we assume the tension to be 90 N throughout the string? We could have done that if the string was mass less.
    9 years ago by Pkumar Sinha

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  24.  
    25. sir why u have taken the expression for average power instead of maximum power?
    9 years ago by Aditi Gupta

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  25.  
    26. why does an object get permanently deformed when it is streched by a very large force?
    10 years ago by akashdeep sengupta

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  26.  
    27. can someone explain the reflection phenomenon of waves
    10 years ago by akashdeep sengupta

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  27.  
    28. sir how do we count the no. of nodes? if equation of wave is given?
    10 years ago by Rahul Bhatia

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  28.  
    29. what is sonometer and what is its function?
    11 years ago by shashi rathore
    Ans 1 ->
    sonometer is a device used to measure frequency of a standing wave
    11 years ago by archana050968@gmail.com
    Ans 2 ->
    function is one type of variable which depands on a time and changes with time
    11 years ago by mitesh patel
    Ans 3 ->
    A sonometer is an apparatus made of a hollow box having two holes. A string is attached to it by which the transverse vibrations of strings can be studied.
    11 years ago by Kshitij Khandelwal
    Ans 4 ->
    google it !
    10 years ago by Mohak narang
    Ans 5 ->
    Pls check ur sequence....constrined motion should be after NLM.
    9 years ago by SANTOSH KUMAR SINGH
    Ans 6 ->
    no gutiu mandsiemnr dsce 197.52l6;3.gd
    8 years ago by Shlok
    Ans 7 ->
    ok
    7 years ago by tushya sharma

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  29.  
    30. Sir, if the tension is inc. in S, then its freq. is inc. and certainly beat freq. is decreased to 2 Hz. What is the significance of it here??
    11 years ago by kartik
    Ans 1 ->
    As beat frequency is decreasing to 2Hz that implies the difference in freq of A and B is decreasing that is giving us a hint that freq of B is lower than that of A than only if freq of B increases diff will decrease.. otherwise B could have a freq of 304 Hz also which will be wrong in this case...
    10 years ago by Physics Galaxy

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  30.  
    31. what is longitudinal standing waves?
    11 years ago by shashi rathore
    Ans 1 ->
    longitudinal standing waves are produced by superposition of two coherent sound waves (or any longitudinal waves) travelling in opposite direction...like we get in resonance tube and kundts tube...
    10 years ago by Physics Galaxy
    Ans 2 ->
    can someone explain the reflection phenomenon of waves
    10 years ago by akashdeep sengupta
    Ans 3 ->
    Since the reflected wave and the incident wave add to each other while moving in opposite directions the appearance of propagation is lost and the resulting vibration is called a standing wave. When sound waves in air (pressure waves) encounter a hard surface there is no phase change upon reflection.
    9 years ago by Gaurav Chauahn

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