Is speed of light same in air and vacuum?

Speed of sound wave in air

4 Let us list some of the factors, which could possibly influence the speed of wave propagation:(i) nature of the source.(ii) direction of propagation.(iii) motion of the source and/or observer.(iv) wavelength. (v) intensity of the wave. On which of these factors, if any, does,depend? :the speed of light in vacuum

The speed of electromagnetic waves in vacuum is equal to

What is the speed of light in a dense medium of polarising angle 30^@ ?

Light enters from air to glass having refractive index 1.50 what is speed of light in glass? Speed of light in vacuum is 3xx10^8 m s^-1 .

Light enters from air to diamond having refractive index 2.4. what is the speed of light in diamond ? Given speed of light in vacuum =3xx10^8 m s^-1 .