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Electron MCQ 3

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Questions and Answers

What is the purpose of the hot cathode in an X-ray tube?

Produce electrons (correct)

Produce X-rays directly

Absorb excess energy

Ensure vacuum

Why is the vacuum important in an X-ray tube?

To reduce X-ray production

To slow down electrons

To ensure electrons are not slowed down (correct)

To speed up the electrons

What is the Photoelectric effect?

Production of photons

Ionization of X-rays

Emission of electrons from a metal surface due to suitable electromagnetic radiation (correct)

Generation of kinetic energy

Which statement correctly describes a photon?

Quantum of light energy Signup and view all the answers

What happens to the energy of a photon that exceeds the work function when it strikes a metal?

It is transferred to the electron as kinetic energy Signup and view all the answers

What does the threshold frequency signify in the photoelectric effect?

Minimum frequency needed to cause photoelectric emission Signup and view all the answers

Which component is responsible for producing X-rays in an X-ray tube?

Tungsten target Signup and view all the answers

What is the charge of a single electron?

1.6 $\times$ 10^-19 C Signup and view all the answers

What is the minimum energy required to remove the loosest electrons from a metal's surface called?

Work function Signup and view all the answers

Which of the following best describes what happens when an electron moves through an electric field?

Electric potential energy is converted to kinetic energy. Signup and view all the answers

What is thermionic emission?

The emission of electrons from the surface of a hot metal. Signup and view all the answers