SUMMARY
The discussion focuses on estimating Planck's constant using the photoelectric effect with potassium. The incident light wavelengths of 5.5 x 10-7 m and 5.0 x 10-7 m are analyzed, with the latter resulting in electrons emerging with an energy of 3.62 x 10-20 J. The relationship between photon energy and wavelength is established through the equation E = hc/λ, leading to the formula ΔE = h c / (Δλ) for calculating Planck's constant. By substituting the provided data into this equation, a value for h can be derived.
PREREQUISITES
- Understanding of the photoelectric effect
- Familiarity with the equation E = hc/λ
- Knowledge of work functions in quantum physics
- Basic algebra for solving equations
NEXT STEPS
- Calculate Planck's constant using the derived formula ΔE = h c / (Δλ)
- Explore the concept of work function in detail
- Study the implications of the photoelectric effect in modern physics
- Learn about the historical significance of Planck's constant in quantum mechanics
USEFUL FOR
Students studying quantum physics, particularly those preparing for A-level examinations, as well as educators looking for practical examples of the photoelectric effect and Planck's constant.