Why is perforated cathode used in the discovery of anode rays?

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Perforated cathodes are utilized in the study of anode rays to allow electrons or protons to pass through, facilitating the absorption process. The holes in the electrodes enable the passage of these rays, which ionize the surrounding gas. This ionization results in the formation of positive gas ions that subsequently move towards the cathode. The design of perforated cathodes is essential for observing the behavior of anode rays in experiments. Understanding this mechanism is crucial for advancements in particle physics and related fields.
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Homework Statement
Why is perforated cathode used in the discovery of anode rays? Is there a hole in anode through which cathode rays pass and what causes the glow behind cathode and anode electrode? Is this glow due to the rays?
Relevant Equations
There are no equations.
I really tried to solve it a lot and the info that I gathered is :

Electrons or protons can be ABSORBED by cathode or anode so there must be some hole in the electrode for the rays to pass.
These electrons ionize the gas and those positive gas ions move towards cathode.
 
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Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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