Recent content by Jahnavi

  1. J

    De Broglie wavelength of electron and proton

    Thanks @ehild , @Phylosopher , @Charles Link for your valuable inputs :smile:
  2. J

    Heat radiation and photons

    I think the same . Why ? Irrespective of the heat capacity of the hot object , it will start cooling down till it's temperature becomes equal to the room temperature . Rate of Heat transfer is proportional to the temperature difference (fourth power) . It will be maximum initially and...
  3. J

    De Broglie wavelength of electron and proton

    In the OP in part c) I have assumed energy to be kinetic energy in which case the momentum of proton was more and wavelength smaller . But if I consider energy to be relativistic energy in part c) , then momentum of photon comes out to be less and wavelength of proton is longer . I hope you...
  4. J

    Heat radiation and photons

    Exactly :smile: I asked this because of BvU's objection to my interpretation in post#2 and post#4 .
  5. J

    Heat radiation and photons

    So let it be :smile: If the body cools , the rate of heat transfer will decrease and subsequently the number of photons . No ?
  6. J

    Heat radiation and photons

    Please confirm one thing . What is your interpretation of the problem statement ? Are you comparing 1) the time before and after the hot body is placed . OR 2) the time after the hot body is placed till thermal equilibrium is achieved .
  7. J

    Heat radiation and photons

    Don't you think we just need to consider whether the rate of heat transfer decreases or not ? As the temperature of hot body decreases , rate of heat transfer decreases . As a consequence , the photons comprising the heat radiations should decrease with time . Please have a relook at the OP...
  8. J

    Heat radiation and photons

    Could you explain why my assumption that time after the hot body is placed is incorrect . Don't you think wording of the question should have been " Has the number of photons increased ? " if the question wanted to compare the number before and after the hot body is placed ?
  9. J

    Heat radiation and photons

    Assuming the question is considering time after the hot body is placed , do you think my reasoning is correct ?
  10. J

    Heat radiation and photons

    Homework Statement Homework Equations The Attempt at a Solution No . The number of photons should decrease . As the rate of heat transfer decreases with time , the net electromagnetic radiation from the hot body to the surroundings decrease . Heat radiations are composed of photons ...
  11. J

    MCQ : Comparing characteristics of two photons

    No :smile: I asked because E = Pc doesn't involve vectors whereas in the OP direction of momentum vector was to be considered while relating to wavelength (energy ) .
  12. J

    MCQ : Comparing characteristics of two photons

    In the relation E = Pc for a photon, are both the terms on RHS (momentum and speed ) treated as vectors and is it that a dot product is taken so as to get the energy term E ?
  13. J

    De Broglie wavelength of electron and proton

    Are the two expressions equivalent ? What should we put for P (momentum ) ? Should it be mv ? I am studying basics of photons , so I am quite hesitant to use mv for momentum for other particles as well .
  14. J

    MCQ : Comparing characteristics of two photons

    I think d) will be correct .
Top