Cathode Ray Tube Experiment Quiz

The video explains JJ Thompson's cathode ray tube experiment, which led to the discovery of electrons and the calculation of their charge to mass ratio. The experiment involves an evacuated chamber with a cathode and anode, where an electron beam is generated and deflected by magnetic and electric fields. This deflection helped Thompson conclude that the beam consisted of negatively charged particles, now known as electrons. The video also covers the physics behind calculating the charge to mass ratio using the experiment.

What was the primary discovery made by J.J. Thompson using the cathode ray tube experiment?

• The existence of protons

• The presence of electrons in atoms

• The structure of the nucleus

• The concept of atomic mass

Why is it important to maintain a low pressure inside the cathode ray tube?

• To increase the speed of the electrons

• To prevent the tube from overheating

• To ensure the electron beam is visible

• To allow the electrons to collide with gas particles

What is the role of the anode in the cathode ray tube?

• To create a magnetic field

• To heat the cathode

• To emit electrons

• To attract electrons

Why is the experiment called the 'cathode ray tube' experiment?

• Because the anode emits the rays

• Because the cathode is positively charged

• Because the electron beam originates from the cathode

• Because the tube is made of cathode material

How did J.J. Thompson determine that the cathode ray consists of negatively charged particles?

• By measuring the temperature of the cathode

• By changing the pressure inside the tube

• By using a magnet to deflect the beam

• By observing the color of the glow

What conclusion did Thompson draw from using different cathode materials?

• The cathode material affects the speed of electrons

• Cathode rays are unique to each metal

• All atoms contain negatively charged particles

• Only certain metals can emit cathode rays

What is the significance of the radius of curvature in the cathode ray tube experiment?

• It determines the color of the glow

• It affects the pressure inside the tube

• It helps calculate the charge-to-mass ratio

• It changes the speed of the electrons

Which force is responsible for providing the centripetal force in the cathode ray tube?

• Magnetic force

• Nuclear force

• Gravitational force

• Electric force

How can the speed of an electron be determined in the cathode ray tube experiment?

• By measuring the temperature of the cathode

• By calculating the electric field divided by the magnetic field

• By observing the color of the glow

• By changing the cathode material

What is the charge-to-mass ratio of an electron as discovered by J.J. Thompson?

• -1.76 x 10^-8 coulombs per gram

• 1.76 x 10^-8 coulombs per gram

• -1.76 x 10^8 coulombs per gram

• 1.76 x 10^8 coulombs per gram