| The photoelectric effect occurs when photoelectrons are emitted from the surface of a metal after light above a certain threshold frequency is shone on it. The threshold frequency differs depending on the type of metal. | Photoelectric Effect |
| What is the photoelectric effect? | The photoelectric effect is the emission of photoelectrons from a metal’s surface when light above a certain threshold frequency is shone on it. |
| The threshold frequency is the minimum frequency of light required to emit photoelectrons from the surface of a metal. This frequency is unique for each type of metal. | Threshold Frequency |
| What is the threshold frequency in the photoelectric effect? | The threshold frequency is the minimum light frequency needed to emit photoelectrons from a metal's surface. |
| The wave theory could not explain the threshold frequency, as it suggests that any light frequency should cause photoelectric emission since energy would gradually build up with each wave. | Wave Theory And The Photoelectric Effect |
| Why couldn’t the wave theory explain the threshold frequency? | The wave theory suggested that any light frequency could cause photoelectric emission, as energy would build gradually, which contradicts the concept of a threshold frequency. |
| The photon model explains the photoelectric effect by suggesting that EM waves travel in discrete packets called photons, where each photon’s energy is directly proportional to frequency. | Photon Model Of Light |
| How does the photon model explain the photoelectric effect? | The photon model states that EM waves travel in discrete packets (photons), with each photon’s energy proportional to its frequency. |
| In the photon model, each electron can absorb a single photon. Therefore, a photoelectron is emitted only if the light frequency is above the threshold frequency. | Electron Absorption Of Photons |
| What condition must be met for an electron to be emitted in the photoelectric effect? | An electron will be emitted only if it absorbs a photon with a frequency above the threshold frequency. |
| If the light’s intensity is increased, and its frequency is above the threshold, more photoelectrons are emitted per second, although their individual energies remain the same. | Intensity Of Light And Photoelectric Emission |
| What happens to photoelectric emission if the intensity of light is increased? | Increasing light intensity above the threshold frequency results in more photoelectrons emitted per second, but their energy remains the same. |
| The work function of a metal, denoted by φ, is the minimum energy required to emit electrons from the metal's surface. | Work Function |
| What is the work function of a metal? | The work function is the minimum energy needed to emit electrons from a metal's surface, denoted by φ. |
| The stopping potential is the potential difference needed to stop photoelectrons with maximum kinetic energy. It allows us to calculate the maximum kinetic energy of these electrons. | Stopping Potential |
| What is the stopping potential, and what does it measure? | Stopping potential is the potential difference needed to halt photoelectrons with maximum kinetic energy, enabling measurement of their maximum kinetic energy. |
| The work function of a metal, denoted by φ, is the minimum energy required to emit electrons from the surface of the metal. | Work Function |
| What is the work function of a metal? | The work function is the minimum energy needed to emit electrons from a metal's surface, denoted by φ. |
| The maximum kinetic energy of photoelectrons can be calculated with the formula: E_k(max) = eV_s, where e is the charge of an electron and V_s is the stopping potential. | Stopping Potential Formula |
| How can the maximum kinetic energy of photoelectrons be calculated using stopping potential? | It can be calculated with E_k(max) = eV_s, where e is the electron charge and V_s is the stopping potential. |
| The photoelectric equation is E_k(max) = hf - φ, where hf is the energy of the incoming photon, φ is the work function, and E_k(max) is the maximum kinetic energy of the emitted electrons. | Photoelectric Equation |
| What does the photoelectric equation E_k(max) = hf - φ describe? | It describes the relationship between the photon's energy, the work function, and the maximum kinetic energy of emitted electrons. |
| Energy can be calculated as Energy = Charge × Voltage. This relationship is used to calculate the maximum kinetic energy from stopping potential. | Energy, Charge, and Voltage Relationship |
| How is the maximum kinetic energy of a photoelectron related to charge and voltage? | The maximum kinetic energy equals charge times voltage, calculated as E_k(max) = eV_s. |
