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

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  1.  
    2. how is number of molecules equal to (n v s) ?
    3 months ago by

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  2.  
    3. How did you write 1/6 in last step
    11 months ago by NISHANT KUMAR

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  3.  
    4. sir we will take temp in kelvin so it increases by 274 k how can we solve this by taking it in kelvin
    1 years ago by Rajat Yadav

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  4.  
    5. Sir these vedios are sufficient for advanced?
    2 years ago by

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  5.  
    6. sir how you calculated area as s/cosa
    3 years ago by PRITY CHOUDHARY

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  6.  
    7. cannot I see it in 1.5x speed pls reply???
    3 years ago by Saurin Shah

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  7.  
    8. why sir initial pressure is same on both sides
    3 years ago by
    Ans 1 ->
    i agree its correct if it was initially in equilibrium, but its not mentioned and also the movement of diathermic wall can also be due to the initial unequilibrium
    3 years ago by

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  8.  
    9. physics galaxy need to update its basics as per sir
    4 years ago by

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  9.  
    10. Sir as we have raised the temperature of the second container, so the final mixture should have a equal temperature Na ,as heat will flow from body at higher temperature to one at lower temperatures
    5 years ago by Harshit paddar

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  10.  
    11. I am not understanding why the time between two collisions has been taken as the time for rate of change of momentum .please help
    5 years ago by 1M0 4

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  11.  
    12. sir in equilibrium shouldn't the pressure in the lower and upper part be same??
    5 years ago by Hardik Jadwani
    Ans 1 ->
    what if they were not in equilibrium then how could we proceed??
    5 years ago by Hardik Jadwani

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  12.  
    13. WHAT IS THE VALUE OF INTEGRATION OF FUNCTION WHICH DETERMINES THE TOTAL NUMBER OF MOLECULES IN A MAXWELL DISTRIBUTION CURVE.
    5 years ago by pannag biswal

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  13.  
    14. Please upload video of mean free path and collision frequency .
    5 years ago by Anuj Sawhney

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  14.  
    15. Sir where do I borrow physics Galaxy book.And sir which book should I prefer for concept building for chemistry
    5 years ago by prahas ranjan

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  15.  
    16. Sir there was something wrong with the written format .I have written it carefully but after posting the query it changed . All the plus signs were removed automatically and also the each step mixed with other . I don't know what is the problem with this application.But Sir pls answer my query by solving the question by converting temp. to Kelvin.
    5 years ago by prahas ranjan

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  16.  
    17. Sir when we do it by converting temp to Kelvin the answer came to be -173 K . Sir pls tell me where I have gone wrong- As P inc. to 1.01P Temp inc. from(T 273)to(T 274) P/(T 273)=1.01P/(T 274) T 274=1.01(T 273) T 274=1.01T 275.73 0.01T=-1.73 T=-173K
    5 years ago by prahas ranjan
    Ans 1 ->
    no need change in degree k = delta c
    4 years ago by
    Ans 2 ->
    check your answer thrice
    4 years ago by

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  17.  
    18. Sir can we say that P1V1=P2V2 as in both the containers temperature is To ?
    5 years ago by prahas ranjan
    Ans 1 ->
    Thanks sir
    5 years ago by prahas ranjan

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  18.  
    19. Dear sir, Does temperature depends on frame. What is the temperature of vacuum. What is the temperature of a molecule.
    5 years ago by Saurabh kumar

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  19.  
    20. sir,are your videos and question practice from hcv will be enough for jee mains? sir please tell as there is very less time remaining for jee.
    5 years ago by kaushal tomar

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  20.  
    21. Will the final temperature after a long time be 250K?
    5 years ago by Aayush Sharma

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  21.  
    22. Will the final temperature after a long time be 250K?
    5 years ago by Aayush Sharma

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  22.  
    23. Why intial pressure is also equal?
    6 years ago by sameer utradhi
    Ans 1 ->
    Because initially the separator is at rest. If initial pressure is not equal then the separator will move either of the two side.
    5 years ago by Aayush Sharma

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  23.  
    24. what is meant by two successive collisions?
    6 years ago by Manoj Mummoorthy

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  24.  
    25. Why did you added the volumes
    6 years ago by Rutuja jagdale
    Ans 1 ->
    As container is closed volume will remain same only pressure and temperature can vary .....And this was the only reason that sir has been added volumes and equated it to final volume. .........I hope it will help....
    5 years ago by Shwetank Chandra

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  25.  
    26. question says a portion of gas has been let out, then why the volume stays same in equation2?
    6 years ago by
    Ans 1 ->
    As volume of container is same for every condition ......
    5 years ago by Shwetank Chandra

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  26.  
    27. Respected Sir, I think it should be (J/degree celcius) instead of J/s
    6 years ago by Pratyush Ranjan Roul
    Ans 1 ->
    Unit should be J/K considering SI Units
    6 years ago by

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  27.  
    28. where can I find the solutions for the question set?
    7 years ago by Sparsh.G.Sarode

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  28.  
    29. sir why did you take molar mass of nitrogen as 28* 10^-3.it should be just 28
    8 years ago by saikiran
    Ans 1 ->
    In the formula molar mass should be in Kg not in gm thats why we should multiply 10^-3 to the molar mass
    8 years ago by Aryan Malguri

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  29.  
    30. Dear sir when we take 1degree centigrade into 274 kelvin the answer would have been different from 100 kelvin why it happens ?
    8 years ago by gaurav sahu

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  30.  
    31. we should convert density 1.3 gm/ltr to 1.3*1000 gm/cubic meter???
    8 years ago by Ayush Agarwal
    Ans 1 ->
    for SI units
    6 years ago by

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  31.  
    32. At NTP Temperature = 293 K and P = .987 atm . Then why did you use different values ?
    8 years ago by Simran Malhotra
    Ans 1 ->
    At stp temp=273k and pressure= 1tm=10^5 pa
    8 years ago by Ayush Singh Rajput

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  32.  
    33. delta(Q)=change in int energy only when the process is isochoric ??
    8 years ago by ABHISHEK MALAKAR
    Ans 1 ->
    enclosed in a vessel means Const volume , work done by gas is zero
    3 years ago by P. ENOCH

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  33.  
    34. how can we say that the pressure on both side is same initially?
    8 years ago by sudeep khare

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  34.  
    35. In final state why the temp. remains same?
    8 years ago by sudeep khare
    Ans 1 ->
    as volume is not changed therefore temp also not changed.
    8 years ago by Ayush Singh Rajput

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  35.  
    36. Sir what is rectangular hyperbola? I think in PV graph the line should be straight?
    8 years ago by sudeep khare
    Ans 1 ->
    The hyperbola whose asymptotes are at right angles to each other is called a rectangular hyperbola. The angle between asymptotes of the hyperbola x2/a2 – y2/b2 = 1 is 2 tan–1 (b/a).
    7 years ago by tirumala vinay

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  36.  
    37. The temperature of an ideal gas in a tube of uniform cross section of length L varies linearly from one end T(not) to other end T (L).Calculate the total number of moles of gas present in the tube. The gas pressure is P (not) and volume V (not)...
    9 years ago by Mohak Sharma

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  37.  
    38. If... they ask to calculate angular mean speed then what? sir..
    9 years ago by lalabhai
    Ans 1 ->
    You can equate the rotational kinetic energy of a molecule to 0.5I(omega)^2 and get the rms value of omega... avg rotational kinetic enregy can be given as (0.5)(rotn degrees of freedome)*kT
    9 years ago by Physics Galaxy

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  38.  
    39. Sir,, i cant understand ,,.third step i,.e..n not vs.......and area is equal to S/cos theta.....plzzz clear my doubt sir..
    9 years ago by lalabhai
    Ans 1 ->
    vS is the volume flow rate of the particles in cubic meter per second and when we multiply it with molecular density n0...it gives the rate at which particles collide with the wall..... And S is the stream area so area on which stream will be colliding on the wall will be S/(cos theta) you can see it by making a triangle on stream where it is striking the wall...
    9 years ago by Physics Galaxy
    Ans 2 ->
    vS is the volume flow rate of the particles in cubic meter per second and when we multiply it with molecular density n0...it gives the rate at which particles collide with the wall..... And S is the stream area so area on which stream will be colliding on the wall will be S/(cos theta) you can see it by making a triangle on stream where it is striking the wall...
    9 years ago by Physics Galaxy

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  39.  
    40. I, request U ,,that piston moves high pressure to low pressure might be ..
    9 years ago by lalabhai

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  40.  
    41. Sir first of all thanks for your videos and all your previous help. In the above explanation why isnt delta t taken for only the small time interval during the collision. Instead why is it taken for the movement of the particle from one end to other and then back to the same end. .....................Like in lectures of conservation of moment. only time that was taken during the collision was taken into consideration in many problems..............Please help
    9 years ago by Mohak Sharma

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  41.  
    42. Sir in NCERT textbook page 325, eqn 13.17 it is written that PV=(2/3)E Whereas in the above lecture it is given P=(2/3)E Sir please help me
    9 years ago by Mohak Sharma
    Ans 1 ->
    Both are same... In this lecture it is written that E is kinetic energy density i.e. it is energy per unit volume and in NCERT E is taken for total kinetic energy... Please watch the video carefully again...hope you understand now...
    9 years ago by Physics Galaxy

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  42.  
    43. Sir first of all thanks for your videos and all your previous help. In the above explanation why isnt delta t taken for only the small time interval during the collision. Instead why is it taken for the movement of the particle from one end to other and then back to the same end. .....................Like in lectures of conservation of moment. only time that was taken during the collision was taken into consideration in many problems..............Please help
    9 years ago by Mohak Sharma
    Ans 1 ->
    Sir in NCERT textbook page 325, eqn 13.17 it is written that PV=(2/3)E Whereas in the above lecture it is given P=(2/3)E Sir please help me
    9 years ago by Mohak Sharma
    Ans 2 ->
    As we have considered all collisions to be elastic here... it will not make any difference what I have taken or we take it for small time as in one direction at every collision velocities of identical particles are swapping so if we consider one particle is moving at uniform velocity in one direction from one wall to another..there is no problem in this consideration as at every collision momentum in that direction will remain same due to elastic collision...
    9 years ago by Physics Galaxy

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  43.  
    44. if a tube containing ideal gas closed at both ends is rotated at a constant angular velocity, why there is a pressure difference across its ends .
    9 years ago by vishal
    Ans 1 ->
    In the reference frame of tube gas experiences the centrifugal acceleration in outward direction due to which a pressure gradient exist in the tube...
    9 years ago by Physics Galaxy

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  44.  
    45. sir can Vrms =Vmean if yes pls explain
    9 years ago by vishal
    Ans 1 ->
    rms and mean velocities are different... rms vel is used for analyzing inertial character of gases like kinetic energy, pressure and momentum and mean vel is used to calculate the mean distance traveled by molecules like mean free path..
    9 years ago by Physics Galaxy

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  45.  
    46. during random motion why gas molecules do not interact with each other
    9 years ago by hemanth goud
    Ans 1 ->
    They do interact but since Kinetic theory neglects particles potential energies(i.e thier interaction energies) it neglects your question
    9 years ago by Ch Vishal
    Ans 2 ->
    They do collide!!
    9 years ago by Mudit garg
    Ans 3 ->
    yes they collide with each other and transfer their momentum from one to the other
    8 years ago by bhanu pratap
    Ans 4 ->
    they do not interact with each other because there is no force of attraction or repulsion the molecules of an ideal gas.
    7 years ago by zuben tashildar
    Ans 5 ->
    7 years ago by zuben tashildar

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  46.  
    47. Good morning sir, Can you please explain me why you wrote 100 K instead of 100 degree celsius as initial temperature. Thank you!
    10 years ago by The Physicist!
    Ans 1 ->
    Gas laws are applicable only for temperatures on absolute scale or the kelvin scale
    8 years ago by Satyam srivastava

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  47.  
    48. How can we say that final temperature is T0
    10 years ago by manish
    Ans 1 ->
    By law of conservation of internal energy. (f/2)(n1)RTo + (f/2)(n2)RTo = (f/2)(n1 + n2)RT On solving above equation: T = To
    10 years ago by The Physicist!
    Ans 2 ->
    Initially, the containers have same temperatures so there will be no heat transfer so final temperature is t0
    7 years ago by Mrinal kanti mahato

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  48.  
    49. How can we say that final temperature is T0
    10 years ago by manish

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