PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
In a photoelectric experiment, light of frequency 1.3ν0 (where ν0 is the threshold frequency of the metal) and intensity I is initially used. Two successive changes are then made:
1. The intensity is increased to 3I while keeping the frequency 1.3ν0 unchanged.
2. The frequency is now changed to 1.6ν0 while maintaining the intensity at 3I.
For each step, predict qualitatively the change (increase, decrease, unchanged) in the following quantities compared with their initial values:
(a) Saturation photocurrent after Step 1
(b) Stopping potential after Step 1
(c) Saturation photocurrent after Step 2
(d) Stopping potential after Step 2