Question
What evidence from J.J. Thomson's experiments with the cathode ray led to the plum pudding model of the atom?
The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.
The beam was attracted to a negative charge and repelled by a positive charge, showing that atoms contain small, positively charged particles.
The beam was positively charged and had significant mass, showing that atoms have a positive, dense nucleus.
The beam was neutral and had significant mass, showing that atoms contain neutral particles in the nucleus.
Answers
GPT-4o mini
The correct evidence from J.J. Thomson's experiments with cathode rays that led to the plum pudding model of the atom is:
**The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.**
Thomson's experiments demonstrated that cathode rays are composed of small, negatively charged particles (later named electrons). This finding implied that atoms must contain these negatively charged particles embedded within a positively charged "soup," leading to the formulation of the plum pudding model of the atom.
**The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.**
Thomson's experiments demonstrated that cathode rays are composed of small, negatively charged particles (later named electrons). This finding implied that atoms must contain these negatively charged particles embedded within a positively charged "soup," leading to the formulation of the plum pudding model of the atom.