Collision Frequency, Mean free time (Relaxation time) & Mean Free Path | JEE Main Questions

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In the video expressions for Collision frequency, Mean free time or relaxation time and mean free path are derived.
Questions asked in JEE main on theses concepts are also solved.
Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion the average time of collision between molecules increases as Vq, where V is the volume of the gas. The value of q is (γ = Cp/Cv) (JEE Main 2015)
An ideal gas is enclosed in a cylinder at a pressure of 2 atm and temperature 300 K. The mean time between two successive collisions is 6 X 10-8 sec. If the pressure is doubled and temperature is increased to 500 K the mean time between two successive collisions will be close to (JEE Main 2019, 12 January Evening)
(a) 4 X 10-8 s (b) 3 X 10-6 s (c) 2 X 10-7 s (d) 0.5 X 10-8 s
A 25 X 10-3 m3 volume cylinder is filled with 1 mole of O2 gas at room temperature 300 K. The molecular diameter of O2 and its root mean square speed are found to be 0.3 nm and 200m/s respectively. What is the average collision rate (per second) for O2 molecule? (JEE Main 2019, 10 April Morning )
(a) ~ 1010 (b) ~ 1012 (c) ~ 1011 (d) ~ 1013
Two gases Ar (40) and Xe (131) at same temperature have same number density. Their diameters are 0.07nm and 0.10nm respectively. Find the ratio of their Mean free time. (JEE Main 2020, 9th January Evening)
In an adiabatic process volume is doubled then find the ratio of final relaxation time to initial relaxation time if γ = Cp/Cv (JEE Main 2020, 7 January Evening) Advanced problems Playlist
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[@KRISHNAVENI-zt2dq]

Million thank u sir Extrodinary explanation with derivatives ❤❤❤❤❤❤❤❤❤❤❤❤❤

[@prernasinghchauhan8987]

Aapko pata nhi h aapne kitna achha kaam kiya h... 💙 I was finding the formula and explanation for more than four months .. Thank you so much ❤

[@PhysicswithAkashGoyal]

😊

[@dut_uut]

This is the only good and sufficient video on this topic with jee questions on KZbin. Thanku sir for helping 💗❤❤❤❤❤❤💗💗💗❤💗❤💗❤💗❤💗❤🙏🙏🙏🙏🙏🙏❤❤❤❤❤❤🙏🙏🙏🙏❤❤❤❤❤❤❤❤❤❤

[@shivanimodi9933]

Best video on this topic... Ekdam clear ho Gaya concept💯👌

[@anuragkumar8335]

The only video.....which explained so..well...none were able to satisfy me....but ur explanation was best!!🙏🙏👍👍

[@sohamadak6811]

I had been searching for this so long 🙏🙏 Can't thank you enough

[@sidhisinha2001]

Sir kisi ne ache se nahi padhaya yeh utube pe thank you so much

[@vikashshukla5420]

Great work thankyou so much sir .please continue uploadung such vudeos.

[@PhysicswithAkashGoyal]

Sure 👍

[@ishaanagarwal5547]

Amazing video. Crystal clear concept.

[@niteshsrivastava7992]

Well explained Please make such videos on topics usually neglected by aspirants like geostationary satellites,second law of thermodynamics, Reynolds number,etc Thanks for this video

[@akshatgupta7471]

Thank you so much sir.. ye topic kabhi theek se smjh hi nhi aaya tha but now its crystal clear😊

[@divyanshbhatnagar719]

Best video i have found on mean free path

[@Prashant-fh6px]

😊👏👍👏 awesome pls comes up with more jee main specific topic, it will be great help 😩 ❤

[@wolfpride9416]

Sir in the 2nd last question on relaxation time and temperature graph, ans should be option 4.

[@radhika5426]

Wonderful explanation Sir! Thanks a lot!

[@tomiokascuteness1909]

Great Lecture Sir Thanks a lot 🙏🏻🙏🏻

[@punamdeviextremefitnessach5087]

Cleared my all doubts thanks a lot sir

[@J_Prince24]

_Awesome_

[@ShivamKumar-dv2gt]

Sir 2 topics aur chahiye mains ke liye Damped oscillation and magnetostatics, pls 🙏🙏🙏 cover them also taking mains pyq at end..

[@shemvishal6061]

Very important topic ....and question too that is discussed after theory

[@manasikulkarni4919]

great explanation ,sir

[@simpleandusefulideas4810]

Thanks very much sir.

[@indiann871]

*Well explained*

[@chakradhar5884]

Thanks a lot sir It will definitely help me in JEE mains

[@atharvphirke3296]

Sir I have a doubt in second last question (graph). Usme ham mean free time inversely proportional to VxN* lenge, fir V prop. to root temp, and N*= P/kT lenge, to answer D aa raha hai.

[@atharvphirke3296]

Sir pls tell.

[@RishiRaj-tm3ep]

Thanks a lot sir

[@roxon6929]

Love you sir.. Thank you very much

[@mdjabir9817]

Mja AA gya me bhutt khush hu last second question accha tha

[@divyakumar8147]

thanks sir

[@vedbrahmbhattiit-j4497]

thanks a lot sir 🥰😀

[@entropy1322]

Thanks sir!!

[@Aizalfatima31]

After 3 hours I get the concept Finally....plz Sir keep uploading videos of Advanced chemistry plz plz plz plz🙏🙏🙏🙏🙏🙏👆👆

[@ASHISHKUMAR-hn6lu]

Maza aa gaya sirji.

[@shailendragoel8454]

Where do you live and teach?

[@imbesatansari8775]

Thank you sir 😊

[@Aman-cp9hg]

Sir what if we consider biomolecular collision then we should multiply collision no. with N*/2 to get collision frequency??

[@PhysicswithAkashGoyal]

Yes

[@indiann871]

*Again thanks*

[@sjd9092]

Sir what is v Is it avg velocity ??

[@PhysicswithAkashGoyal]

yes it is average

[@itsamankumar403]

Sir will you continue uploading new advanced problems

[@PhysicswithAkashGoyal]

Yes will try to upload some good concepts videos and problems

[@swastikashree3262]

Yes please do....

[@sunritroykarmakar4406]

sir in the graph problem..it could also be option 4.. if we put V =nRT/P ..please help sir

[@PhysicswithAkashGoyal]

Then we can't say about pressure also... So I have assumed directly that number of molecules per unit volume remains same

[@jatingupta3443]

best

[@rahul2361]

Sir velocity means rms or avg

[@PhysicswithAkashGoyal]

It's average velocity. I have used the expression of average velocity several times in this video and in problems also.

[@rahul2361]

@@PhysicswithAkashGoyal thank u sir

[@muaadakmal511]

Sound is too low

[@PhysicswithAkashGoyal]

Use headphones please

[@kareemulladudekula1481]

Nice! but you really need to 'speak up!'

[@PhysicswithAkashGoyal]

some problem in mic. use headphone

[@sunitayadav461]

Yes sir ur sound is too less in the vdo but very helpful vdo