A asteroid travels at the speed of light.
I found her gum-chewing to be a constant annoyance.
The light was on in my room.
Try to accelerate slowly when leaving the stop light.
Speed of light in water = speed of light in vacuum/refractive index of water
Constant is the speed of light and as the speed of light cannot change it is 'constant'
Nothing except electromagnetic radiation uses light speed.
We will need a torch to light our way.
The car with the fastest speed will win the race.
You can use the equation: wavelength = speed of light / frequency. Given the speed of light (3.00 x 10^8 m/s) and the frequency of the light source, divide the speed of light by the frequency to determine the wavelength of the light.
"The maximum speed limit on the freeway is 70mph."
The rate of advance is directly related to the speed.
Assuming the speed of light in air is already known (it is close to the speed of light in a vacuum), you might check how the light refracts when it changes from air to water (at what angle), and then use Snell's Law.