A 1-liter box contains a sample of nitrogen gas at a temperature of 200 Kelvin.

Question

A 1-liter box contains a sample of nitrogen gas at a temperature of 200 Kelvin. The solid black line in the figure below shows the range of speeds of the gas molecules at this temperature. If the temperature of the gas were doubled from 200 K to 400 K, which line (A, B, C, or D) best represents the new range of gas molecule speeds. A) A B) B C) C D) D The figure below shows a cut-away drawing of a thermos bottle (also known as a Dewar flask), which is a device designed specifically to slow down all forms of heat transfer. If the thermos vacuum seal fails, letting air into the space between the two walls, which form or form of heat transfer will still be slowed down? A) conduction B) convection C) radiation

Explanation / Answer

we know that the speed depends on the temperature as squre root

v = k1 sqrt (T)

Hence the option B is corrrect.

13. Only Conduction be slowed down as no physical contact and Radiation will also decrease as medium will become dense. Air will conduct through convection.

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