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Why is conduction easier in gases if the...

Why is conduction easier in gases if the pressure is low? Will the conduction continue to improve if the pressure is made as low as nearly zero?

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The region of high pressure is called as ___ and the region of low pressure is called as _____.

Show a cylindrical tube of volume V_(0) divided in two parts by a frictionless separator. The walls of the tube are adiabatic but the separator is conducting, Ideal gases are filled in the two parts. When the separator is kept in the middle, the pressure are p_(1) and p_(2) in the left part and the right part respectively. The separator is slowly slid and is released at a position where it can stay in equilibrium. Find the volumes if the two parts.

Knowledge Check

  • Which of the following reaction will be favoured at low pressure ?

    A
    `N_(2) + O_(2) hArr 2 NO`
    B
    `H_(2) + I_(2) hArr 2 HI`
    C
    `PCl_(5) hArr PCl_(3) + Cl_(2)`
    D
    `N_(2) + 3 H_(2) hArr 2 NH_(3)`

  • Gases begin to conduct electricity at low pressure because

    A
    at low pressure gases turn to plasma
    B
    colliding electrons can acquire higher K.E. dur to increased mean free path leading to ionisation of atoms
    C
    atoms breakup into electrons and protons
    D
    the electrons in atoms can move freely at low pressure

  • The region of a sound wave having low pressure is _________ .

    A
    interference
    B
    refraction
    C
    rarefaction
    D
    compression

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    A monatomic ideal gas is contained in a rigid container of volume V with walls of total inner surface area A, thickness x and thermal conductivity K. The gas is at an initial temperature t_(0) and pressure P_(0) . Find the pressure of the gas as a function of time if the temperature of the surrounding air is T_(s) . All temperature are in absolute scale.

    In semiconductors, thermal collisions are responsible for taking a valence electorn to the conduction band.Why does the number of conduction electrons not go on increasing with time as thermal collisions continuously take place?

    An adiabatic vessel of total volume V is divided into two equal parts by a conducting separator. The separator is fixed in this position. The part on the left contains one mole of an ideal gas (U=1.5 nRT) and the part on the right contains two moles of the same gas. initially, the pressure on each side is p. the system is left for sufficient time so that a steady state is reached. find (a) the work done by the gas in the left part during the process, (b) the temperature on the two sides in the beginning, (c ) the final common temperature reached by the gases, (d) the heat given to the gas in the right part and (e) the increase in the internal energy of the gas in the left part.

    Consider a cylindrical tube closed at one end and fitted with a conducting, movable piston at the other end. A cathode is fixed in the tube near the closed end and an anode is fixed with the piston. A gas is filled in the tube at pressure p . Using Paschen equation V = f(pd), show that the sparking potential does not change as the piston is slowly moved in or out. Assume that the temperature does not change in the process.

    In the phenomenon of electric discharge through gases at low pressure,the coloured glow in the tube appears as a result of :

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