Question

[OU.01JThe greatest speed with which any physical object moves is 300,000 km/soundsec. Which of the following has a speed of 300,000 km/sec?

A.light in water
B.light in vacuum
C.sound in air. D. Sound in water

Answer 1

B

Step-by-step explanation:

light in vacuum because it's speed is 3×10^8 which is same as the value in question if we convert the km into m.

Answer 2

The correct answer is B. Light in vacuum has a speed of 300,000 km/sec.

Step-by-step explanation:

The speed of light is the speed at which electromagnetic oscillations propagate in a medium. In vacuum, the speed of light is maximal, and since 1983 it has been defined that the speed of light is 299,792,458 meters per second or close to 300,000 km / s.

Since the speed of light is so great compared to the speed of everyday movements - for example, the light moves about a million times as fast as sound propagates in atmospheric air at standard conditions - until the Enlightenment was believed to be infinite.