Discussion Overview
The discussion revolves around the calculation of the work function of a metal (specifically Sodium) in the context of the photoelectric effect. Participants explore the relationship between maximum kinetic energy of emitted electrons, photon energy, and the work function, while addressing assumptions and methods for measurement.
Discussion Character
- Exploratory
- Technical explanation
- Homework-related
Main Points Raised
- One participant proposes using the equation KE = hf - W to find the work function, questioning whether to assume the velocity of the electron or photon is the speed of light.
- Another participant suggests that there is no need to assume a velocity, as the kinetic energy and photon energy can be used directly to calculate the work function.
- A later reply clarifies that the participant initially misunderstood the availability of kinetic energy, indicating uncertainty about whether to consider photons or electrons in the calculations.
- One participant emphasizes that in standard experiments, maximum kinetic energy is typically measured directly through stopping potential, which provides necessary information to find the work function.
- Another participant asks how to calculate the work function if the stopping potential is known.
- A participant shares a link to a typical photoelectric effect experiment description, indicating it may not be appropriate for school-type work.
- The original poster expresses gratitude for the provided link and clarifies that the inquiry is for personal interest, not academic work.
Areas of Agreement / Disagreement
Participants express differing views on the necessity of assumptions regarding velocity and the method of measuring maximum kinetic energy. There is no consensus on the best approach to calculate the work function, as multiple perspectives on the experimental setup and calculations are presented.
Contextual Notes
Participants mention the relationship between stopping potential and maximum kinetic energy, but there are unresolved details regarding the specific experimental setup and the definitions of variables involved in the calculations.