You have to remember that light ha a wave-particle duality. So a photon act as a wave. When it reflect off of a mirror it does not change speed.
As for the particle accelerator: Imagine a large circle and a small circle. If you take a sector of the same length of each circle the sector of the...
No. The Three Ohm light bulb will be the brightest only if it is connected parallel to the other light bulbs. This is because the voltage drop on this light bulb will be equal to the voltage of the battery. However, in series the voltage drop on this light bulb will be smaller than the initial...