What experiment led to the discovery of the electron?

What experiment led to the discovery of the electron?

• A. The oil drop experiment
• B. The gold foil experiment
• C. The cathode ray tube experiment
• D. The mass spectrometer experiment

Answer: (C)

The discovery of the electron is attributed to the cathode ray tube experiment conducted by J.J. Thomson in the late 19th century. In this groundbreaking experiment, Thomson used a cathode ray tube, which is a glass tube from which most of the air has been evacuated. When an electric current passed through the tube, a beam of particles, later identified as electrons, was produced. Thomson's observations revealed that the cathode rays were deflected by electric and magnetic fields, which indicated that these rays were composed of charged particles. By measuring the degree of deflection, he was able to determine the charge-to-mass ratio of the particles, leading him to conclude that they were much smaller than atoms. This directly led to the identification of the electron as a fundamental component of atomic structure, establishing it as the first subatomic particle discovered. The other experiments mentioned, such as the oil drop experiment and the gold foil experiment, are significant in the field of atomic theory but pertained to different aspects. The oil drop experiment was crucial in determining the charge of the electron, while the gold foil experiment was pivotal in revealing the structure of the atomic nucleus. The mass spectrometer experiment focuses on measuring the masses of particles and does not relate directly

The discovery of the electron is attributed to the cathode ray tube experiment conducted by J.J. Thomson in the late 19th century. In this groundbreaking experiment, Thomson used a cathode ray tube, which is a glass tube from which most of the air has been evacuated. When an electric current passed through the tube, a beam of particles, later identified as electrons, was produced.

Thomson's observations revealed that the cathode rays were deflected by electric and magnetic fields, which indicated that these rays were composed of charged particles. By measuring the degree of deflection, he was able to determine the charge-to-mass ratio of the particles, leading him to conclude that they were much smaller than atoms. This directly led to the identification of the electron as a fundamental component of atomic structure, establishing it as the first subatomic particle discovered.

The other experiments mentioned, such as the oil drop experiment and the gold foil experiment, are significant in the field of atomic theory but pertained to different aspects. The oil drop experiment was crucial in determining the charge of the electron, while the gold foil experiment was pivotal in revealing the structure of the atomic nucleus. The mass spectrometer experiment focuses on measuring the masses of particles and does not relate directly