Answer
See the detailed answer below.
Work Step by Step
$$\color{blue}{\bf [a]}$$
$\text{The evidence of Cathode rays as particles:}$
$\bullet$ They deflect as negatively charged particles when exposed to a magnetic field or an electric field.
$\bullet$ The degree of deflection of cathode rays varied with the strength of the electric or magnetic field, indicating the presence of mass and momentum associated with the particles.
$\bullet$ The rays move in straight lines and cast sharp shadows, indicating that they travel in straight paths and do not spread out like waves.
$\bullet$ Cathode rays could penetrate thin metal foils but were stopped by thicker ones, which means that they have a certain amount of penetrating power.
$\bullet$ When cathode rays strike a target, they produce heat and could cause certain materials to emit light, indicating energetic interactions. Recall the fluorescence phenomena when they strike glass tubes.
$$\color{blue}{\bf [b]}$$
$\text{The evidence of Cathode rays as waves:}$
$\bullet$ Cathode rays exhibited behavior similar to the light waves. They could be diffracted when passing through narrow slits or gratings.
$\bullet$ The intensity of the cathode rays varied with the amplitude of the electrical discharge, similar to how the intensity of waves can be adjusted.
$\bullet$ The rays could travel long distances in a straight line for 150 times the mean free path of known particles without significant spreading.
