Electron SAQ

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What is the charge of a neutron?

No charge

What is the formula to find the energy of a charged particle in an electric field?

E = qV

What is the energy gained or lost by an electron when it moves through a potential difference of 1 V?

1 eV

What is the charge of an electron in coulombs?

– 1.6 × 10-19 C Signup and view all the answers

What is the formula for the energy of an electron in an electric field, given the voltage across the field?

E = eV Signup and view all the answers

In an electric field, what type of energy is converted to kinetic energy as an electron moves through it?

Electric potential energy Signup and view all the answers

What is the effect of increasing the voltage across an electric field on the kinetic energy of a charged particle?

The kinetic energy increases Signup and view all the answers

What is the relationship between the mass of a particle and its velocity in an electric field?

A smaller mass results in a greater velocity Signup and view all the answers

What is the result of an electron moving through an electric field with a constant voltage?

The electron's velocity increases Signup and view all the answers

What is the minimum energy required to remove the loosest electrons from the surface of a metal, and what is it referred to as?

The minimum energy required to remove the loosest electrons from the surface of a metal is the work function, denoted by the symbol . Signup and view all the answers

What is the purpose of heating the metal filament in a cathode ray tube, and how does it contribute to the formation of an image on the screen?

The purpose of heating the metal filament in a cathode ray tube is to cause thermionic emission, which emits electrons that are then accelerated towards the screen, resulting in the formation of an image through the conversion of kinetic energy to light energy. Signup and view all the answers

What is the force experienced by an electron moving through a magnetic field, and how is it related to the charge, velocity, and magnetic flux density?

The force experienced by an electron moving through a magnetic field is F = qvB, where F is the force, q is the charge, v is the velocity, and B is the magnetic flux density. Signup and view all the answers

What is the result of an electron striking the fluorescent material in a cathode ray tube, and what type of energy conversion occurs?

When an electron strikes the fluorescent material in a cathode ray tube, it results in the conversion of kinetic energy to light energy, producing a visible image on the screen. Signup and view all the answers

What is the significance of the work function in determining the energy required for thermionic emission, and how does it relate to the energy of the particles on the surface of the metal?

The work function determines the minimum energy required for thermionic emission, which is the energy needed to remove the loosest electrons from the surface of the metal, depending on the energy of the particles on the surface. Signup and view all the answers

What is the main hazardous effect of X-rays in medical applications?

Ionization, which can cause cancer Signup and view all the answers

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

To prevent electrons from being slowed down Signup and view all the answers

What is the Photoelectric effect, and what causes it?

The emission of electrons from the surface of a metal due to electromagnetic radiation of suitable frequency Signup and view all the answers

What is a photon, and what type of energy does it represent?

A photon is a quantum of light energy, or electromagnetic radiation Signup and view all the answers

What is the material used as the target in an X-ray tube, and why is it suitable?

Tungsten, because it has a high atomic number and can withstand high temperatures Signup and view all the answers

What is the relationship between the energy of a photon and the frequency of the electromagnetic radiation associated with it?

The energy of a photon is proportional to the frequency of the electromagnetic radiation associated with it. Signup and view all the answers

When photons strike metal, what happens to the energy of the photon that exceeds the work function?

The energy that exceeds the work function is transferred to the electron as kinetic energy. Signup and view all the answers

What is the role of Planck's constant in the equation E = hf?

Planck's constant is a proportionality constant that relates the energy of a photon to its frequency. Signup and view all the answers

What determines the energy required to remove an electron from the surface of a metal?

The energy required to remove an electron from the surface of a metal is determined by the work function. Signup and view all the answers

What is the energy of a photon composed of?

The energy of a photon is composed of electromagnetic energy. Signup and view all the answers

What is the physical significance of the threshold frequency (f0) in the photoelectric effect?

The minimum frequency needed to cause photoelectric emission. Signup and view all the answers

What is the relationship between the work function of a metal and the energy of the photons required to emit electrons?

The work function is equal to the energy of the photons of the threshold frequency. Signup and view all the answers

What determines the maximum velocity of the emitted electrons in the photoelectric effect?

The energy of the incident photons above the threshold frequency. Signup and view all the answers

What is the role of Planck's constant in the equation hf = ϕ + 1/2 m v_max^2?

It relates the energy of the photons to the frequency of the electromagnetic radiation. Signup and view all the answers

What is the significance of the term 1/2 m v_max^2 in the equation hf = ϕ + 1/2 m v_max^2?

It represents the maximum kinetic energy of the emitted electrons. Signup and view all the answers