Cracking the SAT Physics Subject Test

behaves like a wave.

7. Name or describe an experiment that demonstrates that light
   behaves like a particle.

Here’s How to Crack It

6. Young’s double-slit interference experiment shows that light behaves
   like a wave. Interference is a characteristic of waves, not of particles.


7. The photoelectric effect shows that light behaves like a particle, where
   the energy of the light is absorbed as photons: individual “particles” of light
   energy.