Home » Ask & Discuss » Physics. » Thermal Physics « Back to Discussion

Thermal Physics

Scorching goIITian

Joined:	1 Feb 2007
Post:	297

9 Apr 2007 20:11:17 IST

0 People liked this

647

heat and temperature......

None

the top of the lake gets frozen at a place wher the surrounding air is at a temperature of -20 degrees......then

1) the temp of the layer of water in contact wit lower surface of the ice is -20 C and that of water at the bottom is 0 C

2) the temp of the layer of water in contact wit lower surface of the ice is 0 C and that of water at the bottom is 4 C

3) the temp of the layer of water in contact wit lower surface of the ice is -20 C and that of water at the bottom is 4 C

4) the temp of the layer of water in contact wit lower surface of the ice is 4 C and that of water at the bottom is 0 C...

Share this article on:

Comments (9)

sneha kulkarni

Scorching goIITian

Joined: 1 Feb 2007

Posts: 297

9 Apr 2007 20:54:14 IST

Like 0 people liked this

please answer neone.........

vishak p

Blazing goIITian

Joined: 9 Feb 2007

Posts: 1347

9 Apr 2007 21:04:17 IST

Like 0 people liked this

hey sneha is the answer (d) ???
confirm this please !

Vinod vm

Blazing goIITian

Joined: 27 Dec 2006

Posts: 465

9 Apr 2007 21:04:35 IST

Like 0 people liked this

well i think the ans is 2nd or 3rd....

preferably 3rd..

plzz correct if am wrong!!

-vinod

Chirag...I rock.. ..

Blazing goIITian

Joined: 10 Feb 2007

Posts: 516

9 Apr 2007 21:16:30 IST

Like 1 people liked this

I think the definite answer is (B)..

Hope I am correct..I can give you my explaination if u want...

By the way, wat's the answer????

sneha kulkarni

Scorching goIITian

Joined: 1 Feb 2007

Posts: 297

9 Apr 2007 21:26:32 IST

Like 0 people liked this

chirag give me ur opinion.....
i do agree wit two options 2 and 3.....

sneha kulkarni

Scorching goIITian

Joined: 1 Feb 2007

Posts: 297

9 Apr 2007 21:28:17 IST

Like 0 people liked this

yes vish.......the answer given here is 4th.......but how can this be possible....i mean if only the surface of the waters is frozen then the water at the bottom should hav temp higher than tat na?
pls tell me if i m wrong......

Uday Prakash

Blazing goIITian

Joined: 7 Dec 2006

Posts: 504

10 Apr 2007 13:38:50 IST

Like 1 people liked this

Hi Sneha,

I've asked my Physics Sir about this. {He's a great intellectual. He gave me the answer but didn't explain it and asked me 2 try 4 da answer. Then instantaneously I got an idea. I was thinkin' about it. After sometime I got it.}

The answer is 2^nd option.

The water in contact with da ice layer 'd have a temperature 0degrees.

It?s 'coz water can't exist below a temperature 0 naturally i.e., without any pressure source.

And generally the common temperature of water 'd be 4degrees.So, the temperature of water at the bottom is 4degrees.

So the answer given in the source (book or 'xam) is wrong.

~Cheerio!!!!

Chirag...I rock.. ..

Blazing goIITian

Joined: 10 Feb 2007

Posts: 516

10 Apr 2007 15:37:44 IST

Like 1 people liked this

Sneha,

I too have the same reason as uday has mentioned..

But, to my knowledge, 4th option is incorrecttt.

cvramana

Forum Expert

Joined: 13 Nov 2006

Posts: 558

11 Apr 2007 20:02:26 IST

Like 0 people liked this

Answer 2 is correct, because the water is forming ice so the temperature is 0 degrees at that point and the bottom of the lake is having highest density of water which is 4 degrees.

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team