Question

Based on the images seen here, identify which phase of matter would transmit light waves the fastest, and why?
Responses
A The gas would transmit the fastest because the particles move the fastest.The gas would transmit the fastest because the particles move the fastest.
B The solid would transmit the fastest because the particles are closest together.The solid would transmit the fastest because the particles are closest together.
C The liquid would transmit the fastest because the particles are the most freely moving.The liquid would transmit the fastest because the particles are the most freely moving.
D The gas would transmit the fastest because there are the fewest particles to interfere with the waves.The gas would transmit the fastest because there are the fewest particles to interfere with the waves.

Answer 1

D. The gas would transmit light fastest — because its much lower particle density means fewer electromagnetic interactions (lower refractive index), so light is less slowed than in liquids or solids.