Question

The \[\dfrac{e}{m}\] ratio of anode rays produced in the discharge tube, depends on the?

Answer 1

Hint: Anode rays can be defined as the positive particles that are produced in the discharge tube on the ionisation of the gas present in the discharge tube. These positive anode rays are also known as canal rays and they get deflected towards the negative plate.

Complete answer:
Anode rays travel straight in the discharge tube and move towards the negative plate in the electric field.
Since, now we have basic knowledge regarding anode rays and their nature, so by looking at our given option we can say that the charge to mass ratio of the anode rays depends on the nature of the gas filled in the discharge tube.
Now let’s understand why the \[\dfrac{e}{m}\] ratio of anode rays produced in the discharge tube, depends on the nature of the gas filled in the discharge tube. On applying electric field the gas filled in the discharge tube undergoes ionisation. This ionisation leads to the production of some negative charges and some positive ions. And these positive ions are known as anode rays.
These positive ions possess some charge and mass .Also different gases yield different positive ions with different charge and mass. Thus, with change in gas filled in the discharge tube, we will get a different charge to mass ratio.
Therefore the correct answer is option A.

Note:
These positive anode or canal rays were first discovered by the German scientist Eugen Goldstein in \[1886\] . He found these rays during his experiments with the crook’s test tube.