Why is it much more difficult to figure out the nature of alpha rays than in the case of beta rays?

The difficulty in elucidating the nature of alpha particles was that they are less deflected by magnetic fields than beta particles, due to the fact that their mass is much larger.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.