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

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  1.  
    2. Sir while using principle of superposition why don't we use vector addition here ?
    4 years ago by Ameya Marakarkandy

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  2.  
    3. Sir I didn't understand the -phi in y2. Can you pls elaborate: y2=A2sin(w(t-phi/w)) , y2=0 at t=phi/w which is the time at which wave 2 reaches the point P so is wave 2 phi/w seconds ahead or behind?
    4 years ago by Ameya Marakarkandy

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  3.  
    4. how can we add both the displacements directly. if they are in different direction so it should be vector sum right?
    5 years ago by 1M0 4

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  4.  
    5. Sir where is the section related to lissajous figures?
    6 years ago by nilanjan das

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  5.  
    6. Why have we taken displacement as A(sinwt)
    6 years ago by Madhav Sharma

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  6.  
    7. why we have taken (-)phi not (+) phi
    8 years ago by Faizan Ali Saiyed
    Ans 1 ->
    Substitute phi as w(delta t). That is, y2 = A2Sin(w(t - delta t)). Now, since wave 2 would be starting the same way wave 1 did delta t seconds before wave 2 arrives, we have t - delta t and not t delta t
    6 years ago by Kishore Sathia

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  7.  
    8. sir what does phase lag mean ?
    8 years ago by Hashmat Mokha

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  8.  
    9. is it imp. for jee?
    8 years ago by Khushboo Jain
    Ans 1 ->
    no
    8 years ago by harsh pareek

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  9.  
    10. Is amplitude same for coherent waves
    8 years ago by shabbir chatrissa
    Ans 1 ->
    not necessarily
    8 years ago by Anuj Saini

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  10.  
    11. how can we write (A1+A2cosphi)=Rcostheta and A2sinphi=Rsintheta. there should be a relation between(A1+A2cosphi) and A2sinphi ?
    9 years ago by sudeep khare
    Ans 1 ->
    In both equations these are constant values A1, A2 and phi and we are expressing these constants in terms of other constants R and theta... relation among constant is also calculated further in the video...
    9 years ago by Physics Galaxy
    Ans 2 ->
    I found to easier to think of it as working backwards: Let R be defined as R = sqrt(A1^2 A2^2 2A1A2cos(phi)). Now since (A1 A2cos(phi))^2 (A2sin(phi)^2) = R^2, we can now write that (A1 A2cos(phi)) = Rcos(theta) and A2sin(phi) = Rsin(theta) where tan(theta) = A2sin(phi)/(A1 A2cos(phi)) We could also have written that (A1 A2cos(phi)) = Rsin(beta) and A2sin(phi) = Rcos(beta), but by convention, cos is used for the former and sin for the latter. Writing it this way makes the final expression easier to remember and less congested.
    6 years ago by Kishore Sathia
    Ans 3 ->
    *A1^2 plus A2^2 plus 2A1A2cos(phi)
    6 years ago by Kishore Sathia

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  11.  
    12. is there any website for maths video lectures similar to physics galaxy? Please post it in comments if any
    9 years ago by Bharath Ram
    Ans 1 ->
    There is no site like PG in maths but for reference you can use khanacademy.org or educator.com
    9 years ago by Physics Galaxy
    Ans 2 ->
    For chemistry you can use gabbarsingh tutorials on youtube.
    9 years ago by sudeep khare

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