The propagation speed of light in vacuum is 300 million M / s. how long does it take for light to travel 90 cm in vacuum
90cm = 0.9m
0.9 / 300000000 = 0.000000003 seconds
What is the propagation speed of light in vacuum? (expressed in km / h and M / s)
c=3*10^8m/s
=1 080 000 000km/h
Light travels along () in the same homogeneous substance. The speed of light in water is faster than that in air (). The speed of light in vacuum is () m / s=
() km / s
Straight line
fast
3×10^8
3×10^5