The radial distance to the event horizon from the singularity of a black hole is called
a. the Roche limit.
b. the Schwarzschild radius.
c. the Hubble unit.
d. none of the above.
Question 2
Which phenomenon shows that quanta of light, or photons, exist?
a. Diffraction
b. Polarization
c. The photoelectric effect
d. Interference