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

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  1.  
    2. Sir, in this problem the charge value has to be calculated as a square value or not.
    4 years ago by KARTHICK RAJA J

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  2.  
    3. sir are these videos updated with the changes in syllabus?
    5 years ago by Blake Langer

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  3.  
    4. Sir can you suggest a good in-depth physics book(I want to major in Physics) which irrespective of IIT provides quite a deep understanding in theory as in your actual physical classroom lectures
    5 years ago by Sanchit Agarwal

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  4.  
    5. in 13.13 ncert solution ; why we are taking nuclear masses rather than atomic masses
    5 years ago by gollasaivenkatesh

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  5.  
    6. Carbon-11 to boron-11 according to the following formula. 11C6 -- 11B5 (e ) V 0.96ev. Assuming that positrons(e ) produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also assume that the neutrinos(V) are massless and do not interact with the environment. At t=0 we have 1ug (=10^-6g) of 12C6. If the half-life of the decay process is t, the net energy produced between time t=0 and t=2t (A) 8×10^18 MeV (B) 8×10^16 MeV (C) 4×10^18 MeV (D) 16×10^16 MeV
    6 years ago by Deepak

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  6.  
    7. What is mass defect
    6 years ago by Adwait Shinde
    Ans 1 ->
    the experimental mass obtained is lesser than the presumed mass ,the diff between them is called mass defect, mass defect=zmp (a-z)mn-M; where mp- mass of proton, mn-mass of neotron, M-experimental mass obtained
    6 years ago by grex gagandeep
    Ans 2 ->
    there is a between zmp and (a-z)mn
    6 years ago by grex gagandeep
    Ans 3 ->
    sum of zmp and zmn -M is mass defect, the plus symbol is not being shown in the ans ,idk why
    6 years ago by grex gagandeep

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  7.  
    8. sir , how did it became (lambda)^2 .......it shud be lamda
    6 years ago by Pratyush Ranjan Roul

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  8.  
    9. is it different or same for different elements ........i got confused!
    6 years ago by Pratyush Ranjan Roul

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  9.  
    10. Sir in many videos you tell about dealing with higher concepts in advanced videos. Where will i get these advanced videos of yours from?
    6 years ago by Abhranil Chandra

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  10.  
    11. not understanding above example even not understanding a single line
    6 years ago by raghav dhamani

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  11.  
    12. sir can nuclear force between proton cannot balance the eletrostatics force between them ?
    7 years ago by Anand kheti

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  12.  
    13. sir in example 8 how is the initial ratio of the nuclei equal to mass of A *at.mass of B by mass of B * at.mass of A (avogadro no: gets cacelled) i am unable to get this i have watched the videos from module 1 itself
    7 years ago by
    Ans 1 ->
    The ratios given in the question are of molecular weights and as molecular weight = mass/Avogadro no. if you plug in the values avogadro no. gets cancelled out
    5 years ago by अमोघ गुप्ता

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  13.  
    14. activity of sample how dn.dt
    7 years ago by Ved Singh
    Ans 1 ->
    what you wish to write... sample activity is dn/dt not dn.dt
    7 years ago by Physics Galaxy

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  14.  
    15. sir in module-21 you said that more the decay constant of a radioactive nucleus more is its activity and correspondingly lesser will be the stability on this module on sheet-2 you said otherwise
    8 years ago by Frank Twain
    Ans 1 ->
    Yes more the decay constant of a radioactive nucleus lesser will be its stability.But in this module sir has said more decay constant more would be the stability of disintegrated product...
    7 years ago by Mohak Sharma

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  15.  
    16. this video is HAZY
    8 years ago by mayukh sengupta
    Ans 1 ->
    Clean your monitor and glasses.
    7 years ago by Manan Jhaveri

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  16.  
    17. sir how you calculated the binding energies of fe nd bi ?
    8 years ago by Mridul Rampal

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  17.  
    18. sir i didnt understand the last point.
    8 years ago by S.nirmal kumar

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  18.  
    19. how can we take that the amount of radium is constant? sir please tell me the reason?
    8 years ago by sesha sai

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  19.  
    20. As radioactive substance have unstable nuclei then why only some atoms disintegrates?all atoms should be disintegrate simultaneously?
    9 years ago by sudeep khare

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  20.  
    21. how can we find cube root of 12 without using log table?
    9 years ago by sudeep khare
    Ans 1 ->
    http://www.wikihow.com/Calculate-Cube-Root-by-Hand It is tedious and time consuming, we are better off using log.
    7 years ago by Manan Jhaveri

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  21.  
    22. Why carbon14 is radioactive in nature? It should be more stable then carbon12 because more neutrons provide more nuclear force?
    9 years ago by sudeep khare

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  22.  
    23. I'd been studying this topic since past 2 days from HCV , but not getting anything. thankyou, you made it crystal clr ..
    9 years ago by Anand Rahangdale
    Ans 1 ->
    Good.
    9 years ago by Physics Galaxy

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  23.  
    24. why does a free proton does not decay like a free neutron
    9 years ago by Ch Vishal
    Ans 1 ->
    Proton has a half life of 10^36 years so considered almost stable particle... it decays to a positron and a pion and further pion decays to gamma ray photons... a rare observable phenomenon so we don't study it at this level...
    9 years ago by Physics Galaxy
    Ans 2 ->
    Respecter sir, will you explain these all these in advance section of physicsgalaxy?
    8 years ago by sudeep khare

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  24.  
    25. Why does nuclear force act on protons and neutrons but not electrons?
    9 years ago by Ch Vishal
    Ans 1 ->
    strong nuclear force is due to gluons between quarks and electrons are laptons... first you need to understand fermions and laptons then the cause of nuclear force between particles... right now it is beyond the scope of this level...
    9 years ago by Physics Galaxy
    Ans 2 ->
    Respected sir, will you explain all these in advance secion?
    8 years ago by sudeep khare

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