Q5 of 22 Page 113

a) What happens in the discharge tube if a high voltage is applied at a gas pressure of 760 mm mercury?

b) What will happen if the pressure is reduced to 0.01mm of mercury?

a) When a high voltage is applied at a gas pressure of 760mm mercury, the discharge tube might burst with the flow of particles of cathode rays and high-pressure mercury particles.

b) If the pressure is reduced to 0.01mm of mercury, the rays from the cathode end will move towards the anode end. As the cathode ray contains particles which are negatively charged.


More from this chapter

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4

Identify the wrong statement regarding the properties of cathode rays and correct it.

1. Cathode rays are made up of large particles with mass and kinetic energy.


2. Cathode rays are deflected by the magnetic field.


3. Cathode rays depend on the nature of the gas inside the tube.

 5

Why does a light paddle wheel placed in the path of cathode rays begin to rotate, when cathode rays fall on it?

 5

How can we prove that the electrons carry a negative charge?

 5

Selvi took a conical flask, put some ice cubes into it and closed it with a stopper. Then, she found the weight of the conical flask using a balance. Its weight was 150 g. After some time, ice started melting and turned into water. She weighed the flask again. The weight was 150 g. What inference would you draw from this experiment?