Electron Work Function -Multiple Choice Questions Quiz

Interactive MCQs on “Electron Work Function”:

Solve the following 10 questions. Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1: What is the electron work function of a material?

(a) The energy required to remove an electron from the material's surface.
(b) The energy released when an electron is added to the material.
(c) The energy required to accelerate an electron to the speed of light.
(d) The energy required to split an electron into its constituent parts.

Question 2: Which factor affects the work function of a material?

(a) Temperature of the material
(b) Material's density
(c) Applied voltage
(d) Nature of the material and its surface characteristics

Question 3: The work function of a metal is 4.2 eV. What is the minimum energy of a photon required to eject an electron from this metal?

(a) 4.2 eV
(b) Less than 4.2 eV
(c) Greater than 4.2 eV
(d) Cannot be determined from the given information

Question 4: Which type of electromagnetic radiation is typically used to measure the work function of a material experimentally?

(a) Visible light
(b) Radio waves
(c) X-rays
(d) Ultraviolet light

Question 5: If a material's work function is 3.0 eV, what is the maximum kinetic energy of an electron ejected from the material when it is exposed to light with a photon energy of 5.0 eV?

(a) 2.0 eV
(b) 5.0 eV
(c) 8.0 eV
(d) 3.0 eV

Question 6: Which metal is commonly used in experiments to demonstrate the photoelectric effect due to its low work function?

(a) Aluminum
(b) Copper
(c) Silver
(d) Tungsten

Question 7: If the wavelength of incident light on a material is decreased, how does it affect the kinetic energy of emitted electrons in the photoelectric effect?

(a) Kinetic energy increases
(b) Kinetic energy decreases
(c) Kinetic energy remains unchanged
(d) Kinetic energy depends on the intensity of light

Question 8: Which of the following phenomena is NOT explained by the photoelectric effect?

(a) Emission of electrons from a metal surface when exposed to light
(b) Variation of electron energy levels in an atom
(c) Dependence of photoelectron energy on the frequency of incident light
(d) Presence of a minimum threshold frequency for photoemission

Question 9: What happens to the photoelectric current if the intensity (brightness) of incident light on a photoemissive material is increased?

(a) The photoelectric current decreases.
(b) The photoelectric current remains constant.
(c) The photoelectric current increases linearly.
(d) The photoelectric current increases, but only up to a certain point.

Question 10: In the context of the photoelectric effect, what does it mean if the incident light's frequency is below the threshold frequency of a material?

(a) No electrons are emitted from the material's surface.
(b) Electrons are emitted with a high kinetic energy.
(c) Electrons are emitted with a low kinetic energy.
(d) Electrons are emitted with a continuous range of kinetic energies.