12 Questions
What kind of experiment did J.J. Thomson conduct to show the existence of electrons in an atom?
He observed streams of cathode rays in a discharge tube.
What do cathode rays consist of?
Negatively charged particles called electrons
What is the significance of an electrically charged object being able to attract an uncharged object?
It indicates the presence of charged particles in matter at the atomic level.
How did J.J. Thomson observe the cathode rays in his experiment?
By passing electricity through a gas at very low pressure
What did J.J. Thomson's discovery of electrons in an atom demonstrate?
Atoms are made up of positively and negatively charged particles.
Why is it said that the mass and charge of cathode ray particles do not depend on the nature of gas in J.J. Thomson's experiment?
Because the charge and mass of electrons are constant regardless of the gas used.
What did Thomson conclude about all atoms based on the formation of cathode rays?
They contain negatively charged particles called electrons
How does Thomson explain the formation of cathode rays?
Atoms release fast-moving electrons under high electrical voltage
How is an electron described based on the information provided?
A negatively charged particle present in all the elements except hydrogen
What is the relative mass of an electron compared to a hydrogen atom?
$1840$ u
Where are electrons located within an atom?
Outside the nucleus
What symbol is commonly used to represent an electron?
$e$
Test your knowledge of electric charge generated by rubbing objects like a comb or glass rod. Learn about the origin of electric charge from within atoms.
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