Solar scientists think there is a very active sunspot on the far side of the Sun. Sunspots are a common feature, especially during Solar Maximum, but we are yet to see this particular one. It will ...

But in Earth-bound reality, traveling at the speed of light (299,792,458 meters per second, or 670,616,629 miles per hour, in a vacuum) in a clunky rocket is a physical impossibility.

Even a sewing needle measuring just 35mm could cause significant damage if moving at an absurdly high speed, resulting in ...

If an object travels at a relative speed, which is a non-negligible fraction of the speed of light, with respect to an observer, the length of the object in the travel direction will appear ...

On its surface, entanglement allows particles to communicate over vast distances instantly, apparently violating the speed of light. But while ...

is. Light of frequency \(4.6\times 10^{14}Hz\) travels at a speed of \(1.24\times 10^{8}ms^{-1}\) in diamond. Calculate the refractive index of diamond for this colour of light.

The change in direction of a ray depends on the change in the speed of the light and can be used to calculate the refractive index. For the example above the refractive index \(n\) of the glass is ...