Question

How are cathode rays produced using discharge tube? give four properties of cathode rays. why does e/m ratio of

negatively charged particles remain constant for all gases? draw a neat labelled diagram for cathode ray tube.

Answer 1

JJ.Thomson shows rays have paticles with mass(m) therefore, ratio is e/m.

Step by step explanation:

• JJ. Thomson conducted an experiment to find out about the properties and constituents of cathode rays.
• At high voltage, Thomson pushed electricity through the discharge tube, holding a gas at very low pressure;
• a green fluorescence is seen emanating from the other end of the discharge tube.
• The fluorescence is the product of rays released from the cathode to the anode (positive plate) in the discharge tube. Those rays are therefore called Cathode rays.
• The mass and charge of the particles from the cathode ray is not based on the gas drawn from a discharge tube.
• Cathode rays are stream of negative particles called electrons.
• Hence, this experiments shows rays have paticles with mass(m) therefore, ratio is e/m.

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