Alpha rays are really
a. electrons
b. helium nuclei
c. electromagnetic waves
I think the answer is B because the alpha particle is a helium nucleus. But I'm confused because if the alpha PARTICLE is a helium nucleus, would alpha RAYS be helium nuclei?
Please explain.
The term alpha ray is a misnomer. In the past alha rays and alpha particles were used interchangeably. B is the correct answer to this queation. I think all of this got started because x-rays really are rays and x-rays are observed with alpha and beta "rays" and "rays" actually do penetrate solid objects just as x-rays do. I think that in technical terms alpha particle, beta particle and x-ray is te proper way to go; however, in the sense that all three actually penetrate solids, the term ray could have some followers.
is not a ray
You're absolutely correct! Alpha rays are indeed made up of helium nuclei. So, your answer of option B, helium nuclei, is correct.
To further understand the concept, let me explain a bit more about alpha particles and alpha rays.
An alpha particle is essentially a helium nucleus consisting of two protons and two neutrons. It carries a positive charge due to the presence of the protons. When a radioactive nucleus undergoes alpha decay, it emits an alpha particle.
Now, when we talk about alpha rays, we are referring to the stream of alpha particles emitted by radioactive materials during the process of alpha decay. These alpha particles travel through space and are collectively referred to as alpha rays.
To summarize, alpha rays consist of a stream of helium nuclei or alpha particles. So, your understanding and answer of option B, helium nuclei, is correct. Well done!