16 Questions
What did Michael Faraday's experiments with electrolytes suggest about the nature of electricity?
That electricity has a particulate nature
What was the major insight obtained from the experiments on electrical discharge through gases?
The discovery of the electron
Why did Dalton's atomic theory fail to explain the results of many experiments?
It did not account for the existence of sub-atomic particles
What did the experiments with partially evacuated tubes, known as cathode ray discharge tubes, lead to?
Insights into the structure of the atom and the discovery of sub-atomic particles
What did Michael Faraday's laws regarding electrolyte solutions suggest about electricity?
That electricity has a particulate nature
Why did scientists mainly begin to study electrical discharge in partially evacuated tubes in the mid-1850s?
To gain insights into the structure of the atom and discover sub-atomic particles
What is the purpose of the two thin pieces of metal, called electrodes, sealed in the cathode ray tube?
To allow the flow of current from cathode to anode
What happens when cathode rays pass through the perforated anode and strike the zinc sulphide coating?
A bright spot on the coating is developed
According to the characteristics of cathode rays, what can be concluded about their behavior in the absence of electrical or magnetic field?
They travel in straight lines
Based on J.J. Thomson's measurements, what did he argue that the amount of deviation of particles from their path in the presence of electrical or magnetic field depends upon?
The magnitude of the negative charge on the particle
Why were certain kind of materials like fluorescent or phosphorescent used to observe the behavior of cathode rays?
To glow when hit by cathode rays and make their behavior observable
What did Thomson's experiments with the cathode ray tube suggest about the behavior of cathode rays in the presence of electrical or magnetic field?
They behave similarly to negatively charged particles
What did Thomson conclude about electrons based on his measurements using electrical and magnetic fields?
Electrons are basic constituent of all atoms
What happens to cathode rays when there is no electrical or magnetic field present?
They travel in straight lines
What did Thomson use to measure the ratio of electrical charge to the mass of electrons?
Cathode ray tube
What was observed when sufficiently high voltage was applied across the electrodes in a cathode ray tube?
A stream of particles moved in the tube from cathode to anode
Explore the limitations of Dalton's atomic theory and the discovery of sub-atomic particles in the twentieth century. Learn about the challenges faced by the theory in explaining experimental results and the subsequent discoveries in this field.
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