Final answer:
The observation that the type of metal of the cathode doesn't change the nature of cathode rays implies that cathode rays are made up of electrons, which are fundamental components present in all metals.
Step-by-step explanation:
One implication of Thomson's observation that the type of metal used to make the cathode does not affect the cathode rays is that the particles that make up cathode rays must be present in all metals. This means that no matter which metal is used for the cathode, the same cathode rays, or streams of negatively charged particles, are emitted. This was a groundbreaking realization, leading Thomson to conclude that these particles, now known as electrons, were fundamental components of all atoms. Thomson's experiments with cathode rays demonstrated that the cathode itself was not the source of the rays; instead, these rays were inherent to all kinds of matter, suggesting that electrons were a universal constituent of all forms of atomic matter, rather than being unique to specific metals or gases.