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

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  1.  
    2. pls tell me what does h means and its value
    10 months ago by PRATHAM AGRAWAL

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  2.  
    3. thanks sir
    2 years ago by shivam kumar jha

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  3.  
    4. how n1=2n2 , what happened to 8 ? I don't understand
    3 years ago by Saideep Varma

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  4.  
    5. please please ?? add playback speed soon to have a great experience.please please please..........
    3 years ago by k lakshmanan

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  5.  
    6. sir how to solve big calculation of modern physics easily
    3 years ago by vikas Gupta

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  6.  
    7. Sir, can we use rydberg's equation and substitute n1 and n2 directly?
    3 years ago by

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  7.  
    8. sir, in module number 20 , u told that if the energy(of photon) is excess than the required amount then the electron acts as a transparent medium but in this module (22) u are telling that excess energy is converted into K.E. of electron.... Could u please explain the reason for this
    3 years ago by

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  8.  
    9. Sir you have defined binding energy instead of ionization energy.
    3 years ago by Naman Kumar

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  9.  
    10. sir i think we should write mu as (mass of e) (mass of nucleus of hydrogen)/( mass of hydrogen + mass of nucleus). why have you taken mass of hydrogen atom in place of mass of nucleus??????
    4 years ago by Swapnil Aggarwal

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  10.  
    11. what is positron and positronium?
    4 years ago by Swapnil Aggarwal

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  11.  
    12. Why I am unable to see the pictorial representation?
    4 years ago by

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  12.  
    13. sir the videos of atomic structure and nuclear reactions are not available on YouTube. can you please upload them there also?
    4 years ago by Pragathi Yp

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  13.  
    14. sir is there an option to view the videos on the app at a faster speed ( 2x)? I would kindly request you to help me with this issue.
    4 years ago by Pragathi Yp

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  14.  
    15. Sir do i need to watch advanced illustrations if i am exclusively preparing for JEE Mains or NEET/JEE lectures are sufficient for mains ?
    4 years ago by

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  15.  
    16. Sir, if in the problem only excitation energy is mentioned by default we will take it with respect to n=1??
    4 years ago by

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  16.  
    17. Solved example is enough for jee mains practice or not
    5 years ago by Zulekha

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  17.  
    18. sir, in some books and theories rydbergs constant is not considered as constant its value may vary . so how it value can vary please explain
    5 years ago by Rhythm Jain

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  18.  
    19. Thanks from bottom of my heart.
    5 years ago by Sumit

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  19.  
    20. please upload q from modern physics in q-grid
    5 years ago by RAVI PRAKASH

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  20.  
    21. 46 is not opening
    6 years ago by chayan gurele

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  21.  
    22. sir can we use Rydberg's formula in this question.
    6 years ago by ojausmane

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  22.  
    23. sir can we round off value of "hc" to 12400
    6 years ago by ojausmane

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  23.  
    24. sir i wanted to point out the mistake- lambda 2/lambda 1 will be 27/5 not 5/27 so the answer is incorrect.
    6 years ago by ABHISHEK SHANKAR

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  24.  
    25. sir is it like that when an e- makes a transition from n4 or n3 to n1,then multiple photons are released indicating quantisation of energy??
    7 years ago by Aman Jain
    Ans 1 ->
    Just watch the vedios damn it!!!!!!
    5 years ago by sudip chakraborty

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  25.  
    26. sir i am weak in modern physics and optics but i found that most of the jee mains questions are from these two chapters .please help me what should i do to thorough these chapters
    7 years ago by ariya

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  26.  
    27. A small mirror of mass m is suspended by a light thread of length L . The angle through which the thread will be deflected when a short pulse of laser of energy E falls normally on the mirror is ?
    7 years ago by Ali Hasan

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  27.  
    28. sir plz tell me the use of above concept. where it is actually used?
    7 years ago by Shorya Gupta

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  28.  
    29. compton scattering process is in syllabus of advance and mains?
    7 years ago by Shorya Gupta

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  29.  
    30. What happened if K.E. of colliding electron is 10.2eV?
    9 years ago by sudeep khare

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  30.  
    31. Sir How can we prove 2nd postulate?
    9 years ago by sudeep khare

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  31.  
    32. Why maxwell theory fails in this model? Why electron don't emit photon when it revolve in an orbit?
    9 years ago by sudeep khare
    Ans 1 ->
    see in help book
    8 years ago by divyansh singh jadon
    Ans 2 ->
    because electron will be moving with uniform velocity and accelerated charge only will release e-m radiations
    8 years ago by venkata satyanarayana
    Ans 3 ->
    No.The above statement is incorrect since acceleration occurs due to continuous change in direction of velocity. It is because the electrons revolve in stationary orbits that is no energy is absorbed or released when they are in the same orbit.
    7 years ago by Sarvottam Kumar

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  32.  
    33. What is the concept of reduced mass?
    9 years ago by sudeep khare

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  33.  
    34. Why should we consider mass of nucleus and take reduced mass and what happens if i don't do so ?
    9 years ago by Karthikesh
    Ans 1 ->
    If you don't consider the reduced mass... the result will be slightly different as in normal cases we take mass of electron m(e) in the expression and in actual it should be taken as mu(e) which is slightly less so result will vary...In this problem of calculation in difference of IP, if you don't take reduced mass your answer will be zero as the difference is only due to this reason as charges on both nuclei are same...
    9 years ago by Physics Galaxy

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  34.  
    35. Cant first the electron be excieted to n= inf , and then de-excieted to get max wavelength ???
    9 years ago by Anand Rahangdale
    Ans 1 ->
    When spectrum of a gas is to be produced, it is done in the way you have written... but during de-excitation all possible radiation wavelengths will be emitted along with max wavelength...
    9 years ago by Physics Galaxy
    Ans 2 ->
    To get it excited to n=inf a very large amount of energy will be required.
    8 years ago by nehal gupta

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  35.  
    36. in an atom do both the nucleus the electron revolve?
    9 years ago by Ch Vishal
    Ans 1 ->
    No. Only electrons revolve(around the nucleus)
    9 years ago by Sabbarish Govindarajan
    Ans 2 ->
    no....only the electrons revolve around nucleus
    9 years ago by shweta agrawal

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  36.  
    37. the force on the electron is dependent on principle quantum number by....???
    9 years ago by Neelam
    Ans 1 ->
    Principal quantum number denotes the distance of electron from nucleus so it affects the force on it...
    9 years ago by Physics Galaxy

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