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

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  1.  
    2. Sir,i found answers of quiz questions related to Thermal Physics wrong.Pls rectify the mistakes.
    1 years ago by

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  2.  
    3. Hello sir. PG videos are not coming. Kindly look into the same
    2 years ago by

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  3.  
    4. sir here K of the conducting part was not given and if e of the body was given then will we be using Stefan's law for this question?
    3 years ago by

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  4.  
    5. sir on app there is no option for controlling playback speed i request u to provide that option on app
    3 years ago by Priyanshu agarwal

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  5.  
    6. Sir is JEE full syllabus there
    3 years ago by

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  6.  
    7. sir, is pathfinder better or phy. galaxy
    4 years ago by

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  7.  
    8. is sun a blackbody
    5 years ago by Hardik garg

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  8.  
    9. Sir is this concept is right? As screen is a black body therefore it will absorb all the heat incident on it ( from the inner shell) and hence it's temp will be T . Sir pls reply .
    5 years ago by prahas ranjan

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  9.  
    10. can we use E(max1)=hc/y1 and E(max2)=hc/y2 to find the ratio
    5 years ago by rishi shrivastva

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  10.  
    11. sir can we find area of frustum??
    5 years ago by Divit Goyal

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  11.  
    12. can convection be called as a consequence of radiation?
    6 years ago by Dharamjeet Singh
    Ans 1 ->
    both are two diff mech
    6 years ago by Dharamjeet Singh

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  12.  
    13. sir why we have multiplied 4.2 X 10 (3) in lhs ? is it to convert cal /gm to joule /kg ?
    6 years ago by Anameeka Saraf

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  13.  
    14. sir, why do we take average of the temperatures ?? and how it is correct??
    6 years ago by Advait Kulkarni
    Ans 1 ->
    sry how can we prove it is correct??
    6 years ago by Advait Kulkarni

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  14.  
    15. Sir are we neglecting the increase of temperature in the surrounding
    6 years ago by Raghav G

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  15.  
    16. Did l have to prepare this for meet
    7 years ago by Sahilmuhammed s

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  16.  
    17. sir in this 17 ques relation is K=K'(1 X/L)
    7 years ago by vedant patel

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  17.  
    18. find temp. at the interface for steady flow of heat through the slab, if heat conductivity of first slab of length is K' and is uniform everywhere but conductivity of 2nd slab of length 2L varies with distance X measured from interface according to the law K=K'(1 X/L). the temp. at the end of the composite slab are T and 2T.
    7 years ago by vedant patel

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  18.  
    19. Sir - Why had we equated the radiation power of sun to the radiation power of planet?
    7 years ago by mihir khare
    Ans 1 ->
    ok got it
    7 years ago by mihir khare

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  19.  
    20. sir where it is given that T1 is greater than T2?
    7 years ago by Jayesh Gupta

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  20.  
    21. how u have added power with heat current ?
    7 years ago by shahir uddin

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  21.  
    22. sir according to the diagram how can we say that (final result) is the equation for power receieved per unit area on earth as the radiation falls only on one side of earth
    7 years ago by ariya
    Ans 1 ->
    we are also calculating the power for one side of earth only... its not average value, its the actual power per unit area received on earth surface normally...
    7 years ago by Physics Galaxy

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  22.  
    23. i am not able to give the test
    8 years ago by Anil Sharma

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  23.  
    24. sir all examples showed in video lecture are available in physics galaxy book???
    8 years ago by ramesh
    Ans 1 ->
    by mean about examples showed in video??
    8 years ago by ramesh

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  24.  
    25. Sir why exactly the temperature of the outer black screen will become the same as initial temperature of station?
    8 years ago by Mohak Sharma

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  25.  
    26. sir how do we get to know that the rod is in steady state?
    8 years ago by Aditi Gupta
    Ans 1 ->
    For such cases when when temperatures are maintained, we consider the rod in steady state as no initial information is given...
    8 years ago by Physics Galaxy

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  26.  
    27. IS l directly proportional to dQ/dT ????If then why isn't the formula stating ???
    8 years ago by RITIK ASHUTOSH BOMPILWAR
    Ans 1 ->
    its inversely proportional to L.Sir has written it by mistake
    8 years ago by shubham

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  27.  
    28. if dQ/dt is analogous to current and dT is to potential diff . then y is not power in this case equal to (dq/dt)^2*R
    9 years ago by Ratnesh Phadke

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  28.  
    29. When lambda is max how is E max?
    9 years ago by Tavish Katta
    Ans 1 ->
    experimental
    8 years ago by akanksh

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  29.  
    30. Sir in some books it is given deltaQ/deltat=kAdeltaT/L... In this question why differential form of the formula was used and integrated. Why cant the formula involving delta instead of dq,dt be used? Why integration is required here?
    9 years ago by Mohak Sharma
    Ans 1 ->
    As in this problem temperature is varying and due to that rate of heat flow also changes with time so we need to use the differential form...
    9 years ago by Physics Galaxy
    Ans 2 ->
    As in this problem temperature is varying and due to that rate of heat flow also changes with time so we need to use the differential form...
    9 years ago by Physics Galaxy
    Ans 3 ->
    sir how do we get to know that the rod is in steady state?
    8 years ago by Aditi Gupta

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  30.  
    31. Won't temperature gradient be equal to (T1-T2)/(Length of rod) ? Plz answer..
    9 years ago by Aanandita Dhawan
    Ans 1 ->
    It could be if the temperature gradient is uniform through out the rod otherwise it will be taken as dT/dx...
    9 years ago by Physics Galaxy

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  31.  
    32. I, need a derivation, formula of stefans law ..plzzzz
    9 years ago by lalabhai
    Ans 1 ->
    Pl read the book Physics Galaxy Vol II Chapter 4... all derivations are given here...
    9 years ago by Physics Galaxy

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  32.  
    33. sir but how mLv = dQ/dt
    9 years ago by Anand Rahangdale
    Ans 1 ->
    Here m is the rate at which water is being evaporated so mLv is the rate at which heat is being supplied...
    9 years ago by Physics Galaxy

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  33.  
    34. difference between specif icheat and specific heat capacity
    10 years ago by nandyalauday
    Ans 1 ->
    The term 'specific' referes to per unit mass so both of above terms have similar meanings... heat required to raise the temperature of unit mass of substance by unit temp rise...
    9 years ago by Physics Galaxy

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