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Question

What are canal rays?

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Solution

Since the atom as a whole is electrically neutral and the presence of negatively charged particles in it was established, therefore, it was thought that some positively charged particles must also be present in the atom.

Goldstein in 1886 performed a discharge tube experiment in which he took a perforated cathode and gas at low pressure was kept inside the tube, as before.

On passing high voltage between the electrodes, it was found that some rays were coming from the side of the anode which passed through the holes in the cathode and produced green fluorescence on the opposite glass wall coated with zinc sulphide. These rays were called anode rays or canal rays or positive rays.

Canal rays are the positive ion beam. These beams are created by specific types of gas-discharge tubes. The canal ray’s incident on the cathode in a straight line. These rays emerge from the holes in the discharge tube. The canal rays are also called positive rays.

The canal rays are produced in the high voltage gas discharged tube. The protons are accelerated due to the high electric field. These protons reach the cathode of the tube.

Five properties of canal rays:

>Canal rays are positively charged ion beams that are enclosed in the discharge tube.

>Canal rays have a straight path.

>Canal rays are deflected by both electric and magnetic fields because they are charged.

>The canal rays are used to produce fluorescence.

>Canal rays can ionize the gas in which they travel


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