In: Physics
The speed of sound is finite. This means that it has a specific, distinct speed, that we can calculate. Explain an every day example of how we know that the speed of light is finite.
In everyday life we see the objects which are visible to us because of the sunlight present , whose reflection onto our eyes makes us visible.
Now, If we consider that light has no speed limit and is infinite in magnitude, and moreover may it be light or sound they both propagate in air as waves as light and sound waves respectively.
now further if the light propagate in air as light waves then it must have some wavelength and speed and when these waves propagate and oscillate with fixed time and wavelength then only we are able to differentiate the colors of light ( red, green , yellow ,blue etc) such as during the occurrence of rainbow , when we see seven different colors of light.
so, with different colors of light having different wavelength and if the speed of light is infinite then the wave of light will have no time to oscillate and if it does not oscillate., waves would not be produced and thus no color of light will be visible to us, which does not happens in reality in daily life.
so .it is evident that speed of light must have some finite speed.