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Question
Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?
Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?
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Solution
The correct option is D 0.001 mm Hg
DThe air pressure inside the cathode ray tube is low. Because if we increase the pressure of gas present inside the tube then the number of atoms of the gas increases. ie, we have PV =nRTIf volume and temperature are kept constant then pressure is directly proptional to n which is amount of gas in moles. If the number of atoms in the tube increases then electrons will collide with these atoms. These collisions will act as obstructions in the path of electrons thereby preventing electrons from reaching anode.
D
The air pressure inside the cathode ray tube is low. Because if we increase the pressure of gas present inside the tube then the number of atoms of the gas increases.
ie, we have PV =nRT
If volume and temperature are kept constant then pressure is directly proptional to n which is amount of gas in moles. If the number of atoms in the tube increases then electrons will collide with these atoms. These collisions will act as obstructions in the path of electrons thereby preventing electrons from reaching anode.
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