The speed of light in vacuum is about

خلا میں روشنی کی رفتار تقریباً ہے۔

300 Million meters per second

300 Million meters per hour

300,000 kilometers per second

300 Million kilometers per hour

Light travels at about 300,000 kilometers per second in a vacuum with a refractive index of 1.0,

but slows down to 225,000 kilometers per second in water

and 200,000 kilometers per second in the glass.

ND16-3-2023