1 specific charge and the electron

What phenomenon is primarily responsible for the emission of electrons in cathode ray tubes?

• Photoelectric effect

• Thermionic emission

• Compton scattering

• Nuclear fission

• Thomson's method using magnetic and electric fields

• Millikan's oil drop experiment

• J.J. Thomson's cathode ray deflection experiment

In the context of cathode ray tube technology, what role does the anode play?

• It emits electrons when heated.

• It accelerates the electrons towards the screen.

• It deflects the electron beam.

• It captures electrons to create images.

What is the main reason thermionic emission occurs more efficiently in a vacuum?

• Electrons are not attracted to atoms in a vacuum.

• There is less air resistance in a vacuum.

• A vacuum prevents the electrons from immediately recombining with atoms.

• The vacuum increases the temperature of the cathode.

How does the specific charge of an electron affect its trajectory in a magnetic field?

• A higher specific charge results in a straighter trajectory.

• A higher specific charge results in a smaller radius of curvature.

• A lower specific charge results in a higher velocity.

• A lower specific charge results in a smaller radius of curvature.

• It determines the electron's color.

• It helps in calculating the mass of an electron given its charge.

• It is used to determine the strength of an electric field.

• It influences the gravitational pull on an electron.

What is the effect of applying a magnetic field perpendicular to the path of electrons in a cathode ray tube?

• The electrons speed up.

• The electrons slow down.

• The path of the electrons curves.

• The electrons stop moving.

In the context of cathode ray tubes, what is the purpose of the fluorescent screen?

• To emit electrons

• To absorb all the incoming electrons

• To convert electron energy into visible light

• To reflect electrons back to the cathode

A small object with a charge of 𝑞 = +3.0 μ𝐶 and a mass 𝑚 = 2.0 × 10^-6 𝑘𝑔 enters a magnetic field of magnitude 𝐵 = 0.20 𝑇 directed into the page, as shown in the figure below. If the speed of the object is 1000 𝑚/𝑠, the object’s acceleration at the moment it enters the field is most nearly ______.

• zero because the velocity is perpendicular to the magnetic field

• 300 m/s² toward the bottom of the page

• 300 m/s² toward the top of the page

• 600 m/s² toward the bottom of the page

• 600 m/s² toward the top of the page