18. Which of the following is really just a high-energy electron?1 pointbeta particleprotongamma rayalpha particle

To determine which option represents a high-energy electron, let's analyze each choice:

1. Beta Particle: A beta particle is indeed a high-energy, high-speed electron or positron emitted by certain types of radioactive nuclei during beta decay.

2. Proton: A proton is a positively charged particle found in the nucleus of an atom. It is not an electron.

3. Gamma Ray: A gamma ray is a form of electromagnetic radiation, not a particle. It does not contain electrons.

4. Alpha Particle: An alpha particle consists of two protons and two neutrons. It is a helium nucleus and is not an electron.

Final Answer

The correct answer is beta particle, as it is essentially a high-energy electron.