For a freshly prepared potassium surface the stopping potential is observed to be 0.0…
PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
For a freshly prepared potassium surface the stopping potential is observed to be 0.0 V when light of frequency 4.4×10^{14} Hz is used and 1.5 V when the frequency is 6.0×10^{14} Hz.
(i) Assuming a linear relation between V₀ and ν, calculate the value of Planck’s constant h.
(ii) Determine the work function of potassium in eV.
(iii) Predict the stopping potential and the maximum kinetic energy of emitted electrons when light of frequency 7.0×10^{14} Hz is incident on the surface.