A What evidence is there for the existence of photons?
PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation
Problem
1. a What evidence is there for the existence of photons?
(a) What evidence is there for the existence of photons?
(b) A photo-surface has a critical frequency of 2.25×1014 Hz. Radiation of frequency 3.87×1014 Hz falls on this surface. Deduce the stopping voltage.