This Chapter Discusses That Light Sometimes Acts Like a Photon

This chapter discusses that light sometimes acts like a photon. What is a photon?

A) a charged particle in the nucleus of every atom
B) a kind of magnetic substance found in reflective minerals
C) a self-contained "packet" of electro-magnetic energy
D) a kind of sound that is too high frequency for the human ear to hear
E) you can't fool me. Einstein showed that photons were a mistake - they don't exist.