what is the nature of the light ? how many kinds of light do we have?

Question

why the light can go 300,000 km/sec
but the other things can not?
what is the reason?
Do you think one day we will be able to travel about light speed?
and how?

Answer 1

Light is a form of electromagnetic radiation. As such, it is exactly the same as radio waves, microwaves, infra-red, and ultra-violet. The -only- difference between them is their frequency. In an elecromagnetic wave (as in any oscillating system) there must be at least 2 ways to store energy. In the electromagnetic wave these 2 ways are an electric field and a magnetic field. The energy of the wave is continuously handed back and forth between them at a rate which is called the frequency of the wave. The propagation velocity of an electromagnetic wave is governed by 2 characteristics of the medium through which it is traveling. These characteristics are called the permitivity and permeability of the medium. It turns out that these values for empty space set the speed of an electromagnetic wave at a bit under 300,000 km/s. The only thnig that makes 'visible light' unique is that it is the range of frequencies which our eyes have evolved the ability to perceive.

As for accelerating mass to lightspeed; as a mass increases in velocity its mass (called its relativistiv mass) also increases in accord with Special Relativity. The relation is
Mr = M/√(1-(V/c)²)
where V is velocity, c is lightspeed, M is rest mass, and Mr is relativistic mass. As you can see, as the velocity begins to approach c, the mass increases without bound, preventing any finite amount of force from causing further acceleration.

I learned long ago to never say never about anything ☺. But it does seem very unlikely that we'll be able to travel at or above lightspeed at any time in the near future. At present, it does not appear possible. But that was also said about heavier than air flight, breaking the sound barrier, and landing humans on the Moon ☺

HTH

Doug

Answer 2

1 kind.
The reason as best can be explained, is that matter can not go that fast, only energy. Because it takes too much energy to get matter up to that speed. No, we may be able to warp space, but we will not "travel" at light speed.