An index of refraction less than one for a medium would imply ...

[fahad]

An index of refraction less than one for a medium would imply that
 
  A) that the speed of light in the medium is the same as the speed of light in vacuum.
  B) that the speed of light in the medium is greater than the speed of light in vacuum.
  C) that the speed of light in the medium is less than the speed of light in vacuum.
  D) refraction is not possible.
  E) reflection is not possible.

Question 2

Classical theory predicts that the planets can orbit the Sun quite stably.
 
  Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?

[Jmfn03]

Answer to Question 1

B

Answer to Question 2

An electron, classically orbiting the nucleus, is accelerating and electromagnetic theory says it should radiate, and thus the orbit would rapidly decay. A long lived stable atom could not be explained classically.

[fahad]

TYSM

[Jossy]

Thanks for the timely response, appreciate it