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Thermal Physics

Hot goIITian

Joined:	24 Nov 2006
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3 Mar 2007 21:15:59 IST

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KTG

Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Thermal Physics

Consider a sample of oxygen at 300K Find avg time(in hr)taken by a molecule to travel a distance equal to diamater of earth

please xplain

Comments (5)

Chirag...I rock.. ..

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Joined: 10 Feb 2007

Posts: 517

4 Mar 2007 14:49:33 IST

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Ans:- 5.61 Hours

Soln:-

v(avg)=sqrt(8RT/piM)

sustituting the values, we get,

v(avg)=630m/s

diamter of earth=12732km=12732000m

therfore, time=12732000/(630*60*60)=5.61 hours

tejasvi2389

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Joined: 24 Nov 2006

Posts: 133

5 Mar 2007 09:37:37 IST

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Ans is 8hrs explain how this is from HC verma

nishant dash

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5 Mar 2007 09:44:53 IST

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hello chirag,i guess the average velocity value which u have found out is wrong...otherwise,rest of the soln. is correct..do check it once more.

Krishna Gopal Singh

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Joined: 29 Dec 2006

Posts: 5524

8 Mar 2007 00:33:28 IST

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Good work Nishant and nice try chirag. The average velocity is about 444m/s which gives time =8hrs

Chirag...I rock.. ..

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Joined: 10 Feb 2007

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3 Apr 2007 01:56:54 IST

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I have checked my soln, still I am getting 630m/s.

Pl tell me how did you get 444m/s

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