Question

What evidence led to the conclusion that cathode rays had a negative charge? Is there adifference between a cathode ray and a$\mathit{\beta }$ particle?

Short answer

$\beta$Particles are electrons. A cathode ray contains electrons stream which proved by experiment of cathode ray. Thus, cathode ray is $\beta$particles stream.

Step-by-step solution

Experiments by determining the cathode ray charge

The scientist found this by attempting for the determination of cathode ray charge. Experiment consists of cathode ray pass by electric and magnetic fields.

Observation of deflection by passing the rays

If the passing of rays through this field, some deflection amount can be observed on the charge on rays will negative.

Conclusion that the cathode rays had a negative charge

$\beta$Particles are electrons. A cathode ray contains electrons stream which proved by experiment of cathode ray. Thus, cathode ray is $\beta$particles stream.