Q5 of 22 Page 113

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

A light paddle wheel, when placed in the path of the cathode rays, began to rotate because the small particles of the cathode rays (electrons) have mass and energy. This energy is used in rotating the paddle wheel.


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3

Match the entries of column I with the appropriate entries of column II and column III: (Double matching)

 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

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?

 5

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