JEE ADVANCED Thermodynamics: Photon Gas in a Carnot Cycle

[@PHYSICSSIRJEE]

Have you tried this👇 "PHOTON gas in a CARNOT CYCLE" problem in round-2 #fizika exam . The problem was an extension of previous JEE mains question and "free expansion #physicssirjee original " . For those who didn't attempt the exam , try this before the watching the solution and don't miss the practice problems at the end . This is a potential JEE advanced question for the future . Better resolution for Fizika problem 👇 drive.google.com/file/d/1Q1AtgpjR1eLqx5OTkYHY1gp8mZuXHU-b/view?usp=drivesdk You can re-visit the old video on photon gas here 👇 kzbin.info/www/bejne/fZuxpZ55drx9asU The JEE mains 2015 was discussed as a part of "revision series video " here ( go to 41st minute directly )👇 kzbin.info/www/bejne/aZWYpGN_eLt5rJo

[@anishtakshak6515]

Thank you sirji😊❤

[@RamizZamanJEEPhysics]

A similar kind of question came in GATE Physics paper 2020. Wonderful to see our bois are solving these questions in their school life 🥺. Epic Sir JEE 👍🏼

[@heeraksharma1224]

16:25 Yes! The result holds. Is there a reasoning behind this or this is just a coincidence. Maybe the similarity in process equation for adiabatic process in photon gas and ideal gas is the reason.

[@aryanshah17]

OK

[@PHYSICSSIRJEE]

Your guess is correct and reasoning in last para too

[@xyz9106]

Sometimes I feel myself to be unfortunate enough for not having teacher like you in my offline class. But it's too late. 2021 aspirants

[@HrishikeshVinod]

Janardan Sir a huge request. Could you please if possible make a video on the practice problems you have provided if time permits. Thank you

[@Fighter_Believer_Achiever]

17:47, Sir all your videos are best and world class.

[@fanofakashgoyalsir3908]

Sir your approach is really awesome!

[@PHYSICSSIRJEE]

And your DP too 🙂🙏

[@GRAMOLY]

Awesome problem and Lucid explanation sirji as usual!

[@mach2570]

Sir, at 11:55 using the previously defined formula does give us the right relation, but is it correct to use the same one for the adiabatic process as the one for isothermal(we uses VdP=0 to get that one)? Wouldn't we have to use 4PdV + 3VdP =0 to get PV^(4/3)= const and then get VT^3 = constant.

[@anubhavsingh1536]

16:25 Sir, in this question during isothermal process if we assume initial and final volumes as V1 and V2 respectively which depend on pressure and temperature as P(V^4/3)=constant and VT³=constant and as both P and T are constant for the graph as it is a straight line parallel to x-axis therefore V1 becomes equal to V2 and Work becomes zero and eventually U and Q also become zero for the given process but as the graph states it should not be the case so Sir kindly tell what is the problem here??

[@PHYSICSSIRJEE]

The mistake is mixing equations of isothermal and adiabatic processes

[@uttambose2723]

Sir fizika was like a "Mela" for beautiful problem sets which is I think more of a treasure than anything else

[@adityakishore551]

Sir could you please suggest me good book for modern physics for jee advanced and Olympiads?

[@PHYSICSSIRJEE]

Moyer but with your teacher's guidance

[@Lack_Of_Enemies]

wowww

[@kanadshende4051]

Is the efficiency 1- (3Tl/4Th)-(Tl^4/4Th^4)

[@ponbapanda2935]

13:03 I have a doubt. How are we sure alpha is same for every adiabatic curve? Maybe we could write N=f(PV^(4/3)) * alpha * S , where f is a function of PV^(4/3) which is constant in a particular adiabatic process. How do we do it then?

[@PHYSICSSIRJEE]

Hint from video : PHOTON gas need just two variables to define state unlike three for ideal gas. So at a given volume ........ , You can fill the above blank by your thinking, I guess 🙂

[@ponbapanda2935]

@@PHYSICSSIRJEE Wow I understood! That's amazing thanks a lot!!

[@purushottamkumar533]

🔥🔥wow ...I m falling in love with this channel ❤️

[@codeine5642]

We derived the expression for entropy, considering Isothermal process but we use it even for adiabatic... How can we do this?

[@PHYSICSSIRJEE]

Entropy S is a state function, independent of which process you calculated from. ∆S , which is change in entropy ,then, is estimated according to the change occured in a particular process. The key here is to note the understanding of S and ∆S

[@afzal1104]

While deriving Torricelli's theorem, we use Bernoulli's Theorem. But when the fluid is flowing through the orifice, the speed of all the fluid particles passing through a given point in space is not constant, as the height of the liquid, in the container, changes with time. Hence, the flow is clearly not a steady flow. If it is not a steady flow, how can we apply Bernoulli's Theorem at the first place?

[@PHYSICSSIRJEE]

Orfice means very small hole. So the change in speed is so slow that it approximately allows Bernoulli's theorem. As the hole becomes larger the formula we derive becomes farther from reality

[@PHYSICSSIRJEE]

You could have commented on the respective relevant video instead of here

[@afzal1104]

@@PHYSICSSIRJEE Oh, so as I suspected, it's just an approximation. Thank you for the confirmation, sir. I commented here, because this was your latest video, which means, there'd be higher chances of you checking it out.

[@aaryansahu2003]

Loved it sir.Your problems are just next level with core concepts rather than tough calculations.

[@nishchalsrivastava6944]

SIR JI AAPNE PAPER LEAK KARWADIYA ...OP

[@rounakroy3892]

Loved it Sir..Enjoyed Fizika to the fullest... 😁

[@maxwelldemon1219]

Sir could you both sir , make videos of few 5-6 problems of contest which had good concept,like that emissivity I couldn't do by infinite series, Gravitational lens one, and few others which may/may not be proposed by you sir. Plz .

[@rushikesh_nale07]

Sir your way of presentation is just Epic!🙌🏻👌🏻

[@parasjain9358]

Sir i forgot about what options I have marked can we know it .

[@bhanuprataprathore900]

When will be able to see our responses of fizika round 2??

[@PHYSICSSIRJEE]

Gramoly will get in touch with you

[@atmanirbharofficialindiaon2789]

Sir as you live in Hyderabad can u tell if I should take CSE in bits Hyderabad? It's average package is 25LPA for cs which is equivalent to top 5 iits so should I take it I'm not confident of advannce and completely left advannce prep for last 2 weeks

[@grimsquidalphax4403]

sir, how can the students(who had not registered for fizika) access all these questions along with their solutions?

[@iqmathsciencelogicalreason2770]

👍👍

[@anirvankrishna2503]

sir can you please share the fizika problems as a pdf from both the rounds. They would be an excellent practice sheet for the last round of preparation.

[@shrisohamkumar3602]

Sir where can I download fizika papers?

[@eshwarnaidu1676]

Sir please make a video on how to study physics and understand and solve question everything in point of jee please sir ?????????

[@shyamkarthikeya4769]

Janardhan sir 🙏 🙏🙏............. 😍Thankyou3000

[@triggeredskeletonbankey8864]

Sir this question made by u??

[@puspalpaul185]

No gawd made it for him and sent it to him through parcel ..... lol

[@ShahrukhKhan-hg9jj]

@@puspalpaul185 puspal tum tele se gayab hogye ho? I'm shreyansh

[@puspalpaul185]

@@ShahrukhKhan-hg9jj yes xd

[@sujay1641]

@@puspalpaul185 lol

[@tabrezahmad9560]

Sir its a humble request Can u plz share the questions of fizika It will help in future

[@jeephysicsmaniac]

Exceptional...

[@vedarthbhawsar4286]

Thank you sir jee🤩

[@chandrashekariyer9329]

Sir I have watched most of your channel videos. I'm giving jee advanced 2021, now I want to revise these videos. Which order should I take up the revision? I'm thinking - 1.AITS select 2. Resolved and irodov and jee pyq series 3. Originals 4.pathfinder (I find Pathfinder difficult) Is this fine sir? Please do guide if you have some add ons And sir please do mention if you have some MUST Watch videos. Thanks!

[@PHYSICSSIRJEE]

Don't take pathfinder lightly , the ones chosen on this channel are very JEE relevant

[@saivinayakakkaldevi2746]

16:15 false

[@HOPE-kw9ej]

Sir if possible can u cover jee main pyq series for jee 2022

[@sarthakmishra1483]

It was a joy to solve this one 😀 made mistake on the 4th part it seems my bias got the better of me but solved A C correctly

[@vibhuverma6252]

Sir please make avedio for question 5

[@Fighter_Believer_Achiever]

Thank you very much sir🥳🥳🥳🥳 October 3 is D Day🤞

[@gowthamnaiduponnana7331]

Sir please do prediction series for jee advanced before 3rd october which really helps us

[@PHYSICSSIRJEE]

Already 240 videos done ✅. More than 200 of them are predicted ones. Please watch them from start at 1.25X speed . Last year 4 questions came from the channel

[@puspalpaul185]

Every channel has its own aura .... plz do not spoil it by compelling one to be like other

[@arnavsharma178]

Sir we also we also want video of q4 in which cap falls of that was unique as well💖

[@emc8630]

Sir at 8:14 u have written dU=3pdv which is wrong I hope so instead u have to write it as dU=3d(pv).....

[@Jeeadv-bv5lm]

Sir please bring fizika in 2022 also, I’m already preparing for it😉

[@rohanmishra2936]

is this you pnj sir?

[@sunritroykarmakar4406]

Photon gas 3

[@ks2372]

op sir jee 😍

[@devashishthakkar6723]

Boom baam sir jee

[@aadityaraj996]

wait over !

[@pranjalbivare7667]

I smashed the like button sir but now my screen is broken.

[@nandakishore1968]

False. And efficiency is 100% . I had solved it mathematically by W/Q I got this ratio as 1.

[@as.if_0077]

Thank you sir

[@yatharthgupta6468]

Ok

[@riturajsharma7108]

Ok

[@amannarwal8552]

ok

[@ShahrukhKhan-hg9jj]

Ok

[@amannarwal8552]

@@ShahrukhKhan-hg9jj ok

[@smol_cute_penguin]

Thank you sir