3 ms·
You might want to look into "phase velocity" and "group velocity", for example on wiki: https://en.wikipedia.org/wiki/Phase_velocity#Relation_to_group_velocity,
by jogundas 7y ago
You might want to look into "phase velocity" and "group velocity", for example on wiki: https://en.wikipedia.org/wiki/Phase_velocity#Relation_to_group_velocity,_refractive_index_and_transmission_speed https://en.wikipedia.org/wiki/Phase_velocity#Relation_to_gro... .